problem stringlengths 14 4.09k | solution stringlengths 1 802k | task_type stringclasses 3
values | problem_tokens int64 5 895 |
|---|---|---|---|
The following is a multiple choice question (with answers).
===Question
What is the most appropriate shielding material(s) to use for a source of radiation which emits both high energy beta particles and gamma rays?
===Choices
A container of wood inside a container of aluminum
A container of plastic inside a container... | A container of plastic inside a container of lead | general_qa | 131 |
The following is a multiple choice question (with answers).
===Question
Assuming that the discovery of new oil wells in other countries leads to an increase in oil supply by non-OPEC members, and OPEC is unable to reach a consensus on a response in the short term, thus acting according to the original strategy, what im... | Decrease | general_qa | 119 |
The following is a multiple choice question (with answers).
===Question
What did the Moche build at the heart of their urban center?
===Choices
the Pyramid of the Sun
the Temple of the Feathered Serpent
a central marketplace for trade
an enormous walled-in precinct of elite residences
the Palace of the Painted Walls
a... | the Pyramid of the Sun | general_qa | 108 |
The following is a multiple choice question (with answers).
===Question
class B{public int balance; public int getBalance() {return balance; }}class A extends B{public int balance; public void use_B_balance() {______}} Which method accesses the balance of class B in the line?
===Choices
getBalance()
his.getBalance()
i... | super.balance | general_qa | 97 |
The following is a multiple choice question (with answers).
===Question
In the actual crystallization of metals, the grain size is controlled by adjusting the ratio of nucleation rate N to growth rate G. Under which of the following conditions can fine grains be obtained?
===Choices
when N/G is very small
when N/G is ... | when N/G is very large | general_qa | 123 |
The following is a multiple choice question (with answers).
===Question
Trees in temperate deciduous forests such as oak, maple, and elm lose their leaves ___________.
===Choices
Sporadically
Never
Occasionally
Irregularly
Gradually
Biannually
Annually
Rarely
Seasonally
Perennially | Annually | general_qa | 72 |
The following is a multiple choice question (with answers).
===Question
In an atmospheric counter-current rotary dryer, a certain crystalline material is dried. Fresh air with a temperature of $t_{0}=25 \mathrm{°C}$ and a relative humidity of $\varphi_{0}=55$% is heated by a preheater to a temperature of $t_{1}=85 \mat... | 18.89m² | general_qa | 507 |
The following is a multiple choice question (with answers).
===Question
Which of the following is not an inherent part of an embedded system?
===Choices
Peripheral circuit
Embedded operating system
Sensors
Input/output interfaces
Processor
Memory
Power management unit
Embedded application software
Real-time clock
Comm... | Embedded operating system | general_qa | 63 |
The following is a multiple choice question (with answers).
===Question
What spans are within the span range of wood joists?
I. 3m
II. 6m
III. 9m
IV. 15m
V. 30m
VI. 60m
VII. 90m
VIII. 150m
===Choices
III, IV, V, VI
III, IV, V, VIII
I, II, III, IV
I, II
I, II, III
III, V, VI, VIII
II, IV, VI, VII
II, III, IV, VI
II, II... | I | general_qa | 152 |
The following is a multiple choice question (with answers).
===Question
The indicators for measuring a water body's self-purification include the P/H index, diurnal variation range of oxygen concentration and _______.
===Choices
water clarity level
dissolved oxygen stability
sediment toxicity analysis
carbon reduction... | oxygen sag curve | general_qa | 94 |
The following is a multiple choice question (with answers).
===Question
What is the basis for dividing the stages in the phased design of floods?
===Choices
Assessment of Aquatic Terrain Seasonal Shift Metrics and Structural Demands
Calculation of Basin Overflow Periodic Alteration Models and Building Criteria
Analysi... | Design of Watershed Flood Seasonal Variation Patterns and Engineering Requirements | general_qa | 174 |
The following is a multiple choice question (with answers).
===Question
The purpose of fire refining is to remove _______ , ______ with specified alloying elements, and recover rare and ______ with economic value.
===Choices
noxious debris;forge base metals;critical metals
harmful residues;form base metals;valuable or... | harmful impurities;produce metals;precious metals | general_qa | 156 |
The following is a multiple choice question (with answers).
===Question
Rain is falling vertically with a speed of 1.7 m/s. A girl is walking with speed of 1.0 m/s in the N - E (north-east) direction. To shield herself she holds her umbrella making an approximate angle $\theta $ with the vertical in a certain direction... | $$\theta=30^0 \:in \:N - E \:direction$$ | general_qa | 289 |
The following is a multiple choice question (with answers).
===Question
Following transverse waves, $y_{1}=2 \sin (100 \pi t-5.3x), $ $y_{2}=2\sqrt {2} \sin \left (100 \pi -5.3x+\dfrac {\pi}{4}\right)$ and $y_{3}=\cos(100\pi t-5.3\ x)$ superpose in a homogeneous medium. Find the resultant amplitude at $x=0$.
===Choice... | $$4\ unit$$ | general_qa | 175 |
The following is a multiple choice question (with answers).
===Question
What is transparent thrombus most commonly found in?
===Choices
Small vein
Central vein
Major artery
Large artery
Capillary
Peripheral artery
Peripheral vein
Large vein
Middle Artery
Small artery | Capillary | general_qa | 57 |
The following is a multiple choice question (with answers).
===Question
A 31-year-old female patient has had three pregnancies over the past three years, all of which ended in miscarriage before 3 months. She also experiences decreased hearing, clear and thin vaginal discharge, lower back pain, a pale tongue with white... | Kidney Qi Deficiency | general_qa | 155 |
The following is a multiple choice question (with answers).
===Question
A cylinder, released from the top of an 95 inclined plane, rolls without sliding and reaches the bottom with speed ${ v }_{ r }$ .Another identical cylinder, released from the top of the same inclined plane, slides without rolling and reaches the b... | ${ v }_{ r }$>${ v }_{ s }$ | general_qa | 226 |
The following is a multiple choice question (with answers).
===Question
Given that the boiler emits 10 m³ of flue gas for each 1 kg of coal burned (under standard conditions), and the coal consumption rate of the boiler is 30 t/h, the gas analyzer measures the volume fractions of the components in the flue gas as $φ_CO... | $$
6. 2 8 \times1 0^{5} m^{3} / h
$$ | general_qa | 424 |
The following is a multiple choice question (with answers).
===Question
The foundation has a rectangular base, with an additional base pressure of 200 kPa. Below the base, there is a $2.5 \mathrm{m}$ thick layer of silty clay followed by a very thick layer of dense sand. It is known that the natural unit weight of the ... | $$
5 2. 8 6 {\mathrm{m m}}
$$ | general_qa | 372 |
The following is a multiple choice question (with answers).
===Question
What year did Johannes Gutenberg invent movable metal type and mechanical printing technology?
===Choices
1440
1460
1448
1451
1450
1449
1452
1455
1453
1445 | 1450 | general_qa | 80 |
The following is a multiple choice question (with answers).
===Question
A 45 kN weight is dropped from an airplane, with the requirement that the landing speed does not exceed $10 \mathrm{m} / \mathrm{s}$. The weight is attached to a parachute with a drag coefficient of $C_{\mathrm{D}}=2$. Ignoring the weight of the pa... | $$
d \geqslant2 1. 8 5 \mathrm{m}
$$ | general_qa | 350 |
The following is a multiple choice question (with answers).
===Question
The southern provenance of the same tree species generally grows ____ than the northern provenance, but has ____ cold resistance.
===Choices
steadily, less
quicker, greater
slower, higher
rapidly, weaker
quickly, minimal
swiftly, reduced
equally, ... | faster, poorer | general_qa | 90 |
The following is a multiple choice question (with answers).
===Question
If the analogue tachograph on your vehicle breaks down, how much time do you have before it needs to be fixed? Select one answer.
===Choices
One week
Two weeks
Ten days
One day
Two days
Four days
Five days
Three days
Three weeks
Six days | One week | general_qa | 75 |
The following is a multiple choice question (with answers).
===Question
Select the correct statements regarding the final product (Y) :
===Choices
It undergoes coupling reaction with benzene diazonium chloride at high temperature (75 - $\displaystyle 85^{\circ}C$) in slightly acidic medium
On treatment with Zn-dust it... | It liberates $\displaystyle H_{2}$ gas with Na | general_qa | 245 |
The following is a multiple choice question (with answers).
===Question
The box foundation of a certain building is 9 meters wide, 20 meters long, and buried at a depth of $d = 5 \text{m}$. The groundwater level is 2.0 meters below the surface. The soil distribution is as follows: the first layer consists of fill soil ... | 292kPa | general_qa | 315 |
The following is a multiple choice question (with answers).
===Question
When the distance $d \!=\! 0.1 \mathrm{cm}$ between parallel plate electrodes, the breakdown voltage is 4.6 kV. The gas is air under standard atmospheric conditions, with $A \!=\! 6460/\mathrm{cm}, \ B \!=\! 1.9 \times 10^{5} \mathrm{~V/cm}$. What ... | $$
3. 0 8 9 \times1 0^{-5},\ 0.206
$$ | general_qa | 428 |
The following is a multiple choice question (with answers).
===Question
In the Criminal Law of the Republic of China, what is the maximum number of years of imprisonment for falsely accusing a public official with the intention of causing criminal or disciplinary action against someone?
===Choices
twelve years
seven y... | seven years | general_qa | 85 |
The following is a multiple choice question (with answers).
===Question
An electron accelerator is to be designed to study properties of linear dimensions of 1 fm. What kinetic energy is required?
===Choices
$240 \text{ MeV}$
$220 \text{ MeV}$
205 \text{ MeV}
$210 \text{ MeV}$
$230 \text{ MeV}$
$190 \text{ MeV}$
$200 ... | $200 \text{ MeV}$ | general_qa | 148 |
The following is a multiple choice question (with answers).
===Question
If air resistance is neglected, a rocket flying at a certain altitude above Earth experiences a gravitational acceleration of $g = 7.32 \, \text{m/s}^2$. Due to the thrust, the rocket also generates another acceleration $a_{\mathrm{t}} = 7.62 \, \t... | $3.37\times10^{4} \mathrm{km}$
$g\sin30^{\circ}$ | general_qa | 449 |
The following is a multiple choice question (with answers).
===Question
Which is the structure that refers to the same part of the body?
===Choices
Strainer surface, Hard surface
Grid cover, Firm cover
Perforated mat, Dense mat
Mesh screen, Solid barrier
Filter disc, Tough disk
Sieve plate, Hard plate
Sieve layer, Stu... | Sieve plate, Hard plate | general_qa | 98 |
The following is a multiple choice question (with answers).
===Question
In a step-index optical fiber, $n_{1}=1.52$, $n_{2}=1.49$. The optical fiber is immersed in water $(n_{0}=1.33)$. Find the maximum acceptance angle for light entering the fiber end face from water as().
===Choices
$$
1 0^{\circ}
$$
$$
1 1^{\circ}
... | $$
1 3^{\circ}
$$ | general_qa | 188 |
The following is a multiple choice question (with answers).
===Question
Let $D$ be a circular sheet of radius $R$, $L$be a tangent line of $D$, the point density of any point $P$ of $D$ is proportional to the square of the distance $d$from $P$ to $L$, the scaling coefficient $k > 0$, and the position of the mass center... | $$ ( \frac{2} {5} R, 0 ) $$ | general_qa | 256 |
The following is a multiple choice question (with answers).
===Question
How is the first eccentricity of an ellipsoid of the Earth defined?
===Choices
e = \frac{\sqrt{a^2 - b^2}}{a}
e = \frac{\sqrt{a^2 - b^2}}{a^2 - b^2}
e = \frac{\sqrt{a^2 - b^2}}{2a}
e = \frac{\sqrt{a^2 - b^2}}{2b}
e = \frac{\sqrt{a^2 - b^2}}{a^2}
e... | e = \frac{\sqrt{a^2 - b^2}}{a} | general_qa | 226 |
The following is a multiple choice question (with answers).
===Question
Electrolyze 0.5 mol/L $Na_{\mathrm{2}}$$SO_{\mathrm{4}}$ aqueous solution using platinum electrodes. At 25°C, the cathode potential is measured to be -1.23 V, and the pH value of the solution is 6.5. The cathode overpotential value is().
===Choice... | $$
\approx0. 8 4 6 V
$$ | general_qa | 253 |
The following is a multiple choice question (with answers).
===Question
An intimate mixture of ferric oxide and aluminium is used as solid fuel in rockets. Find the fuel value per $cm^3$ of the mixture. Heat of formation and densities are as follows.
$$\Delta _f H \,Al_2O_3=-399\,Kcal\,mole^{-1},\Delta_fh Fe_2O_3=-199... | $$4\,Kcal$$ | general_qa | 239 |
The following is a multiple choice question (with answers).
===Question
Which of the following military laws addresses a criminal behavior?
===Choices
Article 120.2
Article 121
Article 120.3
Article 120
Article 120.1
Article 32
Article 120.5
Article 134
Article 122
Article 15 | Article 120 | general_qa | 93 |
The following is a multiple choice question (with answers).
===Question
Let $A$ be the set of all integers $n$ such that $1 \leq n \leq 2021$ and $\gcd(n, 2021) = 1$. For every nonnegative integer $j$, let \[ S(j) = \sum_{n \in A} n^j. \] Determine the maximum value of $j$ less than 2021 such that $S(j)$ is a multiple ... | 2020 | general_qa | 166 |
The following is a multiple choice question (with answers).
===Question
Decreasing order of mass of pure NaOH in each of the aqueous solution.
(I) $50$g of $40\%$(W/W) NaOH
(II) $50$ml of $50\%$(W/V) NaOH $(d_{sol}=1.2g/ml)$
(III) $50$g of $15$M NaOH $(d_{sol}=1$ g/ml).
===Choices
I, II, III
II, III, I
III $=$ II $=$ ... | I, II, III | general_qa | 155 |
The following is a multiple choice question (with answers).
===Question
Because of increasing evidence of damage to the ozone layer,
chlorofluorocarbon (CFC) production was banned in 1996. However, there are
about 100 million auto air conditioners in operation that still use CFC-12
(CF2Cl2). These air conditioners are ... | 2.8 million kg | general_qa | 235 |
The following is a multiple choice question (with answers).
===Question
In what month and year did Gavino Angius become one of the vice-presidents of the Italian Senate?
===Choices
May 2006
April 2003
January 1998
July 2005
March 2011
September 2009
August 2014
October 1989
December 1976
February 1993 | May 2006 | general_qa | 109 |
The following is a multiple choice question (with answers).
===Question
Two identical glass $\left( \mu =3/2 \right) $equiconvex lenses of local length f are kept in contact . the space between the two lenses is filles with water $\left( \mu =4/3 \right) $ the focal length of combination is
===Choices
$$\dfrac { f ... | $$\dfrac { 3f }{ 4 } $$ | general_qa | 190 |
The following is a multiple choice question (with answers).
===Question
In the series oscillating circuit, the inductor $L = 20 \, \text{mH}$ and the capacitor $C = 2.0 \, \mu \text{F}$, initially, there is a charge on $C$ but no current in $L$. What is the time $t_1$ required for the magnetic energy in $L$ to equal th... | $$
1. 5 7 \times1 0^{-4} \mathrm{~ s}
$$ | general_qa | 349 |
The following is a multiple choice question (with answers).
===Question
The standard reduction potential data at 25$^o$C is given below:$E^o (Fe^{3+} , Fe^{2+}) = +0.77 V$;$E^o (Fe^{2+} , Fe) = -0.44 V$$E^o(Cu^{2+}, Cu) = +0.34 V$;$E^o(Cu^+ , Cu) = +0.52 V$$E^o (O_2(g) + 4H^+ + 4e^- \rightarrow 2H_2O ] = + 1.23 V$;$E^... | $$P-3, Q-4, R-1, S-2$$ | general_qa | 575 |
The following is a multiple choice question (with answers).
===Question
The main route of transmission of hand-foot-mouth disease is().
===Choices
Shared utensil contact
fecal orifice pathway
Surface contact transmission
droplets
Direct contact
Inhaling airborne particles
Skin contact exposure
Crossing placental barri... | fecal orifice pathway | general_qa | 74 |
The following is a multiple choice question (with answers).
===Question
Due to the presence of eyes, people have obtained a large amount of visual information through aspects such as shape, color, light, and shadow, and based on this, what form of art is created that is established in visual imagery?
===Choices
Perspe... | Modeling | general_qa | 91 |
The following is a multiple choice question (with answers).
===Question
Draw parallel chords in a circle of radius R. If the points of intersection of these chords with a diameter perpendicular to the chords are equidistant on the diameter, then the probability that the intersection point lies within a line segment on ... | $P(A)=0.866$ | general_qa | 189 |
The following is a multiple choice question (with answers).
===Question
Localisation of parathyroids in hyperparathyroidism is done best with
===Choices
Technetium 99 labelled sestamibi scan with X-ray
I131 scan
Technetium 99 labelled sestamibi scan with PET/CT
USG neck
X ray neck
Technetium 99 labelled sestamibi scan... | Technetium 99 labelled sestamibi scan | general_qa | 163 |
The following is a multiple choice question (with answers).
===Question
The velocity of a moving particle is given by $\overset{\rightarrow}{v}= sin \left(\dfrac{3 \pi}{10} t \right)i+ cos \left (\dfrac{3 \pi}{10}t \right) \hat{j}$. The distance travelled by the particle in first second is:
===Choices
$$cos^{-1} \left... | $$sin^{-1} \left(cos \dfrac{3 \pi}{10} \right) units$$ | general_qa | 295 |
The following is a multiple choice question (with answers).
===Question
Renal blood flow matches systemic blood circulation, primarily relying on ( ).
===Choices
hormonal interaction
autonomic response
metabolic feedback
self-regulation
neural and humoral regulation
positive feedback regulation
humoral regulation
enzy... | self-regulation | general_qa | 75 |
The following is a multiple choice question (with answers).
===Question
Given that hydrogen and oxygen are at the same temperature, please judge which of the following statements is correct?
===Choices
The mass of a hydrogen molecule outweighs that of an oxygen molecule
The density of an oxygen molecule is greater tha... | The mass of an oxygen molecule is greater than that of a hydrogen molecule, thus the root mean square speed of hydrogen molecules must be greater than that of oxygen molecules. | general_qa | 310 |
The following is a multiple choice question (with answers).
===Question
Consider the isentropic flow over an airfoil. The freestream conditions are $T_{\infty}=2 4 5 \mathrm{~ K}$ and $p_{\infty}=4. 3 5 \times1 0^{4} \; \mathrm{N / m}^{2}$ . At a point on the airfoil, the pressure is $3. 6 \times1 0^{4} \, \mathrm{N / ... | $$
0. 5 4 0 4 \ {\frac{\mathrm{k g}} {\mathrm{m}^{3}}}
$$ | general_qa | 440 |
The following is a multiple choice question (with answers).
===Question
Calculate the time of decoupling , $t_{\mathrm{d e c}}$ as() , for a universe of matter and radiation using the WMAP values for $z_{\mathrm{d e c}}=1 0 8 9$ and other quantities.
===Choices
$$
t \,=\, 1. 1 9 4 \times1 0^{1 2} \mathrm{~ s} \,=\, 3 ... | $$
t \,=\, 1. 1 9 4 \times1 0^{1 3} \mathrm{~ s} \,=\, 3 7 8 \mathrm{~ k y r}
$$ | general_qa | 592 |
The following is a multiple choice question (with answers).
===Question
Which of the following statements about the various stages of the ADSR envelope is incorrect?
===Choices
All instruments have distinct A, D, S, R stages
R refers to the release stage, which represents the phase of sound from presence to silence
A ... | All instruments have distinct A, D, S, R stages | general_qa | 104 |
The following is a multiple choice question (with answers).
===Question
A metal sphere carries a charge of $q_{0}$. Surrounding the sphere is a grounded concentric metallic shell with an inner radius of $b$. The space between the sphere and the shell is filled with a medium whose relative permittivity is related to the... | $$
V=\frac{q_{0}} {4 \pi\varepsilon_{0} K} \mathrm{l n} \; \frac{b \left( \, K+r \, \right)} {r \left( \, K+b \, \right)}
$$ | general_qa | 746 |
The following is a multiple choice question (with answers).
===Question
A cylinder of mass 1 kg is given heat of 20000 J at atmospheric pressure. If initially temperature of cylinder is ${\text{2}}{{\text{0}}^{\text{o}}}{\text{C,}}$ then work done by the cylinder will be (given that specific heat of cylinder ${\text{ =... | $${\text{0}}{\text{.02}}\;{\text{J}}$$ | general_qa | 400 |
The following is a multiple choice question (with answers).
===Question
In the paradigm of relational normalization, the fundamental principles of decomposing a relationship are ( ):
I. Achieve lossless join
II. The decomposed relationships are mutually independent
III. Preserve the existing dependency relationships
IV... | I and III | general_qa | 107 |
The following is a multiple choice question (with answers).
===Question
Which of the following is one of the functions of the spleen?
===Choices
Overseeing enzymes and digestion
Governing transportation and transformation
Regulating reproductive functions
Maintaining pH and electrolyte balance
Monitoring growth and ti... | Governing transportation and transformation | general_qa | 93 |
The following is a multiple choice question (with answers).
===Question
What is the purpose of adding a small amount of calcium carbonate during chlorophyll extraction?
===Choices
Help the breakdown of chlorophyll into smaller molecules
Prevent chlorophyll from combining with other substances
Convert chlorophyll to a ... | Prevent the destruction of chlorophyll during extraction | general_qa | 146 |
The following is a multiple choice question (with answers).
===Question
Which of the following is defined as an "abstract" FRBR entity?
===Choices
Book
Chapter
Character
Work
Manuscript
Library
Shelf
Publisher
Format
Edition | Work | general_qa | 54 |
The following is a multiple choice question (with answers).
===Question
At 25°C, dissolve $10^{-5}$ mol of poly(methyl methacrylate) (PMMA) ($M_n = 10^5$, $\rho = 1.20 \text{ g/cm}^3$) in 150 g of chloroform ($\rho = 1.49 \text{ g/cm}^3$). Calculate the mixing enthalpy $\Delta H_m$ and the mixing free energy $\Delta G_... | $$
\Delta H_{m} \!=\! 9. \, 3 8 3 \, ( \mathrm{J} )
$$
$$
\Delta G_{m} \!=\!-1 5. \, 7 ( \mathrm{J} )
$$ | general_qa | 775 |
The following is a multiple choice question (with answers).
===Question
In which year did Sir Edward Burnett Tylor first define animism?
===Choices
1871
1876
1873
1875
1872
1874
1870
1877
1869
1878 | 1871 | general_qa | 81 |
The following is a multiple choice question (with answers).
===Question
The principle of nanomemory is mainly to distribute carbon nanotubes on a sheet substrate, and what is the storage density?
===Choices
10 trillion bytes per square centimeter
5 million terabytes per square meter
25 trillion bits per square centime... | 10 trillion bytes per square centimeter | general_qa | 133 |
The following is a multiple choice question (with answers).
===Question
A particle of mass m is under the influence of a force F which varies with the displacement x according to the relation $F = - kx + {F_0}$ in which $k\;and\;{F_0}$ are constants.The particle when disturbed will oscillate
===Choices
$$about\;x = {... | $$about\;x = 0,\,with\;\omega = \sqrt {k/m} $$ | general_qa | 351 |
The following is a multiple choice question (with answers).
===Question
Given
$$
G(s) = \frac{\omega_{n}^{2}}{s^{2} + 2\zeta\omega_{n}s + \omega_{n}^{2}}
$$
find $$|G(j\omega_{n})|$$What is it?
===Choices
$\frac{\zeta + \omega_n} {2 \zeta}$
$\frac{1} {\zeta + 1}$
$\frac{\omega_n} {\zeta}$
$\frac{\zeta} {1 + \zeta^2}$
... | $\frac{1} {2 \zeta}$ | general_qa | 215 |
The following is a multiple choice question (with answers).
===Question
A horizontal shell and tube condenser has heat exchange steel tubes with a diameter of $\phi$ 25mm×2mm and a length of 3m. Water at 17°C flows inside the tubes with a velocity of 0.7 m/s, exiting at a temperature of 37°C. Saturated hydrocarbon vapo... | $4.71m^{2}$ | general_qa | 370 |
The following is a multiple choice question (with answers).
===Question
Let $p$ be a prime number and denote by $\mathbb{F}_{p}$ the field with $p$ elements. Consider the groups $G=\mathrm{G L}_{2} ( \mathbb{F}_{p} )$ . and $G^{\prime}=\mathrm{P G L}_{2} ( \mathbb{F}_{p} )=G / \mathbb{F}_{p}^{\times}$ , where the group... | $$
|G|=p(p-1)^2(p+1),|G^{\prime}|=p(p-1)(p+1)
$$ | general_qa | 479 |
The following is a multiple choice question (with answers).
===Question
What is the recommended design temperature for low-temperature floor radiant heating systems in Chinese HVAC standards?
===Choices
70°C/40°C
75°C/50°C
65°C/55°C
100°C/85°C
80°C/60°C
85°C/65°C
60°C/50°C
55°C/45°C
45°C/35°C
95°C/70°C | 45°C/35°C | general_qa | 116 |
The following is a multiple choice question (with answers).
===Question
Sometimes, a considerable number of white flowers display many red spots. Which of the following statements is correct?
===Choices
It results from a prolonged environmental stress.
It is the result of a reverse mutation.
It is possible that somati... | It may be the result of transposon activity. | general_qa | 147 |
The following is a multiple choice question (with answers).
===Question
A 65-year-old female was admitted to the hospital with sudden chest tightness and dyspnea for 10 hours. She has a 12-year history of hypertension and a 5-year history of diabetes. Physical examination: BP 160/90 mmHg, sitting up breathing. Bilatera... | Acute myocardial infarction | general_qa | 245 |
The following is a multiple choice question (with answers).
===Question
The hyperfine splitting of the ground state of the hydrogen atom is approximately () .
===Choices
$$
7 0^{-5} \mathrm{e V}
$$
$$
6 0^{-8} \mathrm{e V}
$$
$$
3 0^{-7} \mathrm{e V}
$$
$$
2 0^{-6} \mathrm{e V}
$$
$$
9 0^{-7} \mathrm{e V}
$$
$$
1 0^{-... | $$
1 0^{-7} \mathrm{e V}
$$ | general_qa | 192 |
The following is a multiple choice question (with answers).
===Question
The equilibrium constant for the reaction $\mathrm{I_{2} ( g ) \to2}$ l(g) is 0.26 at 1000 K. What is the corresponding value of $K_{\mathrm{c}}?$ ?
===Choices
$$
0. 0 0 1 8
$$
$$
0. 0 0 4 3
$$
$$
0. 0 0 2 9
$$
$$
0. 0 0 7 2
$$
$$
0. 0 0 5 0
$$
$$... | $$
0. 0 0 3 1
$$ | general_qa | 219 |
The following is a multiple choice question (with answers).
===Question
In three weighing bottles, a small amount of thorium oxide, thorium nitrate, and argon thorium oxide are placed, respectively. Each sample is prepared to contain the same amount of thorium. Cover tightly with aluminum foil, and after one day, remov... | $$
1. 5 \% \quad3. 6 \%
$$ | general_qa | 391 |
The following is a multiple choice question (with answers).
===Question
The surface of a metal has work function 2.66eV. This is illuminated with photons of wavelength 450nm. The de Broglie wavelength of the emitted photoelectrons is:
(Mass of electron = $9 \times 10^{-31} \ kg$)
===Choices
$$8.18 \times 10^{-9} \ m$$... | $$4.09 \times 10^{-9} \ m$$ | general_qa | 222 |
The following is a multiple choice question (with answers).
===Question
The patient has had swollen and painful joints for two months, with difficulty in flexion and extension, aversion to wind and cold. Despite treatment, the symptoms have not improved and have worsened with local joint heat, dry mouth, and constipati... | Gui Zhi Shao Yao Zhi Mu Tang | general_qa | 179 |
The following is a multiple choice question (with answers).
===Question
Let $S$ be the sum of all positive integers $n$ such that $n^2+12n-2007$ is a perfect square. Find the remainder when $S$ is divided by $1000.$
===Choices
460
465
462
467
468
463
461
466
464
469 | 464 | general_qa | 108 |
The following is a multiple choice question (with answers).
===Question
In order to prepare monosulfonated anthraquinones, it is necessary to control a certain amount of anthraquinone that is not sulfonated. Generally, the sulfonate group goes to the ( ) position, and in the presence of a small amount of mercury salt, ... | β, α | general_qa | 126 |
The following is a multiple choice question (with answers).
===Question
Find out the correct order of rate of reaction towards allylic substitution :(I) $CH_3 - CH = CH_2$(II) $CH_3 -CH_2 - CH = CH_2$(III) $CH_3 - \overset{CH_3}{\overset{\!\!\!\!\!\!|}{CH}} - CH = CH_2$
===Choices
${\rm{II}}\,\,{\rm{ > }}\,\,{\rm{III}... | $${\rm{II}}\,\,{\rm{ > }}\,\,{\rm{I}}\,\,{\rm{ > }}\,\,{\rm{III}}$$ | general_qa | 335 |
The following is a multiple choice question (with answers).
===Question
In the IEEE 802.16-2004 standard, the definition of broadband refers to having an instantaneous bandwidth of more than what amount?
===Choices
1.05 MHz
1.5 MHz
0.5 MHz
1.75 MHz
0.75 MHz
2 MHz
0.9 MHz
1.25 MHz
1 MHz
1.1 MHz | 1 MHz | general_qa | 99 |
The following is a multiple choice question (with answers).
===Question
Which vitamin is key to preventing metabolic diseases in poultry?
===Choices
Vitamin D
Vitamin B
Vitamin C
Vitamin F
Vitamin P
Vitamin A
Vitamin B12
Vitamin E
Vitamin K
Vitamin H | Vitamin D | general_qa | 69 |
The following is a multiple choice question (with answers).
===Question
In optical fiber communication systems, using Differential Phase-Shift Keying (DPSK) modulation format, assuming the laser linewidth is 100 kHz, the dispersion parameter $D = 17 \text{ ps/nm/km}$, and the fiber length is 100 km, calculate the phase... | 3.4 rad | general_qa | 133 |
The following is a multiple choice question (with answers).
===Question
A plane wave is incident on a lens of R.I. n=1.5 with one flat side (as shown in figure). The radius of the flat side is R. If all incoming rays are to be focused at the point P at a distance 3R from the flat side, calculate the thickness of the cu... | 2R | general_qa | 228 |
The following is a multiple choice question (with answers).
===Question
A point moves such that its displacement as a function of time is given by ${x}^{3}={t}^{3}+1$. Its acceleration as a function of time $t$ will be:
===Choices
$$\dfrac { 2t }{ { x }^{ 8 } }$$
$$\dfrac { { 2t }^{ 2 } }{ { x }^{ 5 } }$$
$$\dfrac { 2... | $$\dfrac { 2t }{ { x }^{ 5 } }$$ | general_qa | 239 |
The following is a multiple choice question (with answers).
===Question
\( \int_{1}^{{e}^{2}}\frac{dx}{x\sqrt{1-\ln x}} \) = ( )
===Choices
$$2(\sqrt{3}+1)$$
$\sqrt{3}-1$
\(2(\sqrt{3}-1)\)
$$2(\sqrt{3}+2)$$
$$2(\sqrt{3}+1) - 1$$
\( \sqrt{3}+1 \)
$$2(\sqrt{3}-2)$$
\(2(\sqrt{3}+1)\)
$$2(\sqrt{3}+1) - 2$$
$$2(\sqrt{3}+1)... | \(2(\sqrt{3}-1)\) | general_qa | 166 |
The following is a multiple choice question (with answers).
===Question
A plane light wave of intensity $I = 0.20 \,W \,cm^{-2}$ falls on a plane mirror surface with reflection coefficient $\rho = 0.8$. The angle of incidence is $45^o$. In terms of corpuscular theory, find the magnitude of the normal pressure exerted o... | $$1.2 \,N \,cm^{-2}$$ | general_qa | 237 |
The following is a multiple choice question (with answers).
===Question
The density of A is 10 g $\mathrm { cm } ^ { - 3 }$ The quantity of electricity needed to plate an area 10 cm x 10 cm to a thickness of $10 ^ { - 2 }$ cm using $\mathrm { ASO } _ { 4 }$ solution would be (Atomic mass of A = 193 )
===Choices
750... | $$5000 \mathrm { C }$$ | general_qa | 210 |
The following is a multiple choice question (with answers).
===Question
Consider $1 \mathrm{mol}$ of air (with oxygen accounting for $\frac{1}{5}$ and nitrogen accounting for $\frac{4}{5}$) at a temperature of 27°C and a pressure of 1 atm. Now, if the oxygen and nitrogen are separated, with the temperature and pressure... | $$
- R T \operatorname{l n} 5+{\frac{8} {5}} \operatorname{l n} 2
$$ | general_qa | 424 |
The following is a multiple choice question (with answers).
===Question
The error in concentration determination by potentiometric titration is () than that by potentiometric measurement.
===Choices
More profound
Less significant
More substantial
Smaller
Larger
More minor
More precise
Less precise
Less dramatic
Slight... | Smaller | general_qa | 68 |
The following is a multiple choice question (with answers).
===Question
The half-life for a given reaction was halved as the initial concentration of a reactant was doubled. What is n for this component ?
===Choices
3
1/2
1
6
5
-1
2
4
7
0 | 2 | general_qa | 67 |
The following is a multiple choice question (with answers).
===Question
Piaget argued that children's moral judgments are ___.
===Choices
From heteronomy to self-discipline
From egocentric to sociocentric
From self-discipline to heteronomy
From irreversible to reversible
From concrete to abstract
From the former secul... | From heteronomy to self-discipline | general_qa | 92 |
The following is a multiple choice question (with answers).
===Question
Who is the author of the 'emens of Bianjing Relics' from the Ming Dynasty?
===Choices
Li Lian
Li Lianzhu
Li Lianxun
Li Lianzi
Li Lianzhi
Li Lianzhen
Li Lianxi
Li Lianzeng
Li Lianzang
Li Lianzao | Li Lian | general_qa | 91 |
The following is a multiple choice question (with answers).
===Question
A plastic surgeon and a patient entered into a contract. In this contract, the surgeon agreed to perform five independent surgeries on the patient over the next few months for a cost of $10,000 per surgery ($50,000 total). The patient paid $40,000 ... | $20,000 (the difference between the advance payment and the value of the surgeries already performed). | general_qa | 349 |
The following is a multiple choice question (with answers).
===Question
A coil with a resistance of $R_{L}$ and an air-variable capacitor are connected in series with a thermoelectric milliammeter having an internal resistance of 20Ω, connected to an external 400kHz constant amplitude sinusoidal voltage source. When th... | $$
0. 3 5 2 \mathrm{m} \mathrm{H}, ~ ~ Q=5. 8 0
$$ | general_qa | 460 |
The following is a multiple choice question (with answers).
===Question
Which is the correct statement about the setback contact position?
===Choices
Beginning from the occlusal alignment position, the mandible is moved backward and upward about 1 mm, the anterior teeth do not contact, and the cuspal rims of the poste... | Starting from the cuspal interlocking position, the mandible is moved backward and downward about 1 mm, the anterior teeth do not contact, and the cuspal bevels of the posterior teeth are partially contacted | general_qa | 446 |
The following is a multiple choice question (with answers).
===Question
The poetic theory representative work of the '同光体' school is?
===Choices
昭昧詹言
人间词话
愿无尽庐诗话
射鹰楼诗话
石遗室诗话 | 石遗室诗话 | general_qa | 59 |
The following is a multiple choice question (with answers).
===Question
An 18-year-old, lying in bed in the morning, unresponsive, with profuse sweating, drooling, and difficulty breathing. Physical examination reveals: confusion, pinpoint pupils, both lungs filled with moist rales, heart rate 60 beats per minute, musc... | Acute organophosphate poisoning | general_qa | 157 |
The following is a multiple choice question (with answers).
===Question
The gas-phase reaction $\mathrm{A+B=2C+D}$ occurs at 298 K in a constant-volume container. The initial partial pressures of $\mathrm{A}$ and $\mathrm{B}$ are both 101.325 kPa. When the reaction reaches equilibrium, the equilibrium partial pressures... | $$
4. 3 1 \times1 0^{-3}
$$ | general_qa | 361 |
The following is a multiple choice question (with answers).
===Question
The research focus of "Pediatric and Adolescent Hygiene" is ( ).
===Choices
Ages 0-20
0-18 years old
0-24 years old
0-21 years old
Elementary and middle school students
2-24 years old
0-22 years old
0-6 years old
1-25 years old
0-23 years old | 0-24 years old | general_qa | 101 |
The following is a multiple choice question (with answers).
===Question
On which platform was the Lint tool program first developed?
===Choices
AIX
BSD
WINDOWS
MAC OS
LINUX
SOLARIS
UNIX
MINIX | UNIX | general_qa | 51 |
The following is a multiple choice question (with answers).
===Question
Which of the following statements about groups is the most difficult to verify directly without resorting to advanced theorems?
===Choices
If a set has at least one element, then it is a group.
The intersection of sets has both identity and invers... | The universal set R on which a group is defined is closed under the group operation. | general_qa | 210 |
The following is a multiple choice question (with answers).
===Question
In the life cycle of angiosperms, which is the first cell in the gametophyte stage?
===Choices
Prothallial cell
Ovule cell
Zygote
Tapetum layer
Gamete
Endosperm cell
Embryo sac
Spores
Seed
Pollen grain | Spores | general_qa | 79 |
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