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单选题
A refrigerant gives up heat when it goes through ().
A
condenser
B
regurgitate
C
evaporator
D
boil coil
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The heat gained per pound of refrigerant in the evaporator is known as the ______.A.latent heat of vaporizationB.sensible heatC.refrigerating effectD.specific heat of vaporization
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共用题干
How the Body Keeps the Same TemperatureThe temperature of your body should always be the same if you are fine,no matter whether the weather is hot or cold.That is why the doctor tests your temperature with a thermometer when you are sick.Normally, your body teniperature is ninety-eight point six degrees Fahrenheit.If it is_______(51)than that,it is a stire sign that something is wrong with your body.Your body keeps the same temperature all the time,because it balances the heat it produces and theheat it_______(52)off. It is always burning up food and producing heat.It can produce heat faster when the body needs or give off heat faster when the body becomes too warm.Let's see_______(53) this works.The heat of your body is given off chiefly through the skin.When you feel_______(54),your skin is tight and shows"goose flesh".When you feel chilly,you must_______(55)around to keep warm._______(56)your muscles begin to work,bum up fuel and produce more heat.It is not_______(57)toshiver,so you usually prefer warming up by taking exercise,or put_______(58)more clothes to keep warm。When you get warm,the skin is loose and soft. It is so supplied_______(59)blood that heat is giv-en off rapidly. If you get too warm,you begin to sweat and_______(60)body heat is used in evaporating the, moisture in your body.In warm_______(61)or warm rooms,you wear less clothing,_______ (62)heat can be given off freely. You prefer less exercise because your body is warm_______(63),and the extra heat produced by taking too much exercise makes you uncomfortable.Now you see why you_______(64)differently in different kinds of weather. In summer,when it is hot,you feel tired and lazy.You do not care to work or play,but enjoy lying down and doing nothing. When you get out of door in winter,the cold air makes you feel_______(65).You want to run and play._________(61)A:weatherB:climateC:circumstanceD:environment
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单选题When you adjust a thermostatic expansion valve, ().A
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单选题As the refrigerant passes through the valve orifice, its pressure is reduced and part of the refrigerant turns into ().A
liquidB
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vapor
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单选题The refrigerant flows through the evaporator, where it () heat from the refrigerated space.A
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releasesC
gives noD
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单选题In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the().A
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单选题The heat removed from the refrigerant in the condenser of a refrigeration plant is the ()A
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compressorB
condenserC
throttle valveD
evaporator
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单选题Which of the following terms represents the form of heat removed from the refrigerant in the condenser of a refrigeration system?()A
Latent heat of vaporizationB
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SuperheatD
All of the above
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单选题The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by ().A
passing it through the expansion valveB
condensing refrigerant in the system condenserC
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单选题The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().A
remain constant along the tubes lengthB
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vary from section to section through out the heat exchanger
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assessorB
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participantD
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Case fanB
Thermal compoundC
Motherboard riserD
Power supply
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单选题Trunk type diesel engine pistons are effectively cooled when heat is()A
radiated through the engine blockB
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单选题The component of a refrigerating system in which the refrigerant vaporizes and absorbs heat is known as the ().A
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