Heat causes the()of gas.A、growthB、increaseC、expansionD、extension
Heat causes the()of gas.
- A、growth
- B、increase
- C、expansion
- D、extension
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71 There are hard causes of conflict (e.g. conflicting schedules) and soft causes. Soft causes are as important as hard causes. Soft causes include diversity of disciplinary expertise, _____, and the project manager's power of reward and punishment.A. Performance tradeoffsB. Ambiguity of rolesC. Administrative proceduresD. Determining earned value
For what purpose are the diving pipes used?A. To absorb heat from the sun.B. To store heat for future use.C. To turn solar energy into heat energy.D. To carry heat down below the surface.
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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
共用题干Heat Is Killer Extremely hot weather is common in many parts of the world.Although hot weather just makes most people feel hot,it can_______(51)serious medical problems-even death.Floods,storms,volcano eruptions and other natural______(52)kill thousands of people every year.So______(53) extreme heat.Experts say heat may be nature's deadliest killer, Recently,extreme heat was blamed ______(54)killing more than one hundred people in India.It is reported that the total heat of a hot day or several days can______(55)health.Several hot days are considered a heat wave.Experts say heat waves often become dangerous when the nighttime temperature does not_______(56)much from the highest daytime temperature.This causes great stress on the human body. Doctors say people can do many things to______(57)themselves from the dangers of extreme heat. Stay out of the sun,if possible.Drink lots of cool water.Wear light colored clothing made______(58) natural materials;avoid wearing synthetic clothing.Make sure the clothing is______(59),permitting freedom of movement.And learn the danger______(60)of the medical problems,such as headache and vomiting,that are linked to heat.Most people suffer only muscle pain as a(n)______(61)of heat stress.The fiain is a______(62)that the body is becoming too hot.Doctors say those suffering headache or muscle pain should stop all activity,rest in a cool place and drink cool liquids.Do not return to physical _______(63)for a few hours because more serious conditions could develop. Doctors say some people face an______(64)danger from heat stress.Such persons have a weak or damaged heart,high blood pressure,or other problems of the blood system. Hot Weather also increases dangers for people who must take______(65)for high blood pressure, poor blood flow,nervousness or depression.53._________A:does B:doesn't C:do D:don't
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单选题The spreading of fire as a result of heat being carried through a vessels ventilation system, is an example of heat transfer by ().AconductionBconvectionCradiationDwindage
单选题AThe causes are obvious.BThe causes are very complicated.CThe causes are familiar.DThe causes are not well understood.
单选题The sum of the sensible heat and the latent heat of any substance is known as ().Atotal heatBresidual heatCspecific heatDsuperheat
单选题The heat removed from the refrigerant in the condenser of a refrigeration plant is the ()Alatent heat of expansionBsensible heat of condensationCheat of compressionDall of the above
问答题Practice 1 Extremely hot weather is common in many parts of the world. Although hot weather just makes most people feel hot, it can cause serious medical problems even death. Floods, storms, volcano eruptions and other natural disasters kill thousands of people every year. (1)______ Experts say heat may be nature’s deadliest killer. Recently, extreme heat was Named for killing more than one hundred people in India It is reported that the total heat of a hot day or several days can affect health. (2) ______ Experts say heat waves often become dangerous when the nighttime temperature does not drop much from the highest daytime temperature. This causes great stress on the human body. (3) ______ Stay out of the sun, if possible. Drink lots of cool water: Wear light colored clothing made of natural materials; avoid wearing synthetic clothing. Make sure the clothing is loose, permitting freedom of movement. And learn the danger signs of the medical problems, such as headache and vomiting, that are linked to heat. (4) ______ The pain is a warning that the body is becoming too hot. Doctors say those suffering headache or muscle pain should stop all activity and rest in a cool place and drink cool liquids. Do not return to physical activity for a few hours because more serious conditions could develop. Doctors say some people face an increased danger from heat stress. (5) ______ Hot weather also increases dangers for people who must take medicine for high blood pressure, poor blood flow, nervousness or depression.[A] Such persons have a weak or damaged heart, high blood pressure, or other problems of the blood system.[B] Several of these conditions are present at the same time.[C] Most people suffer only muscle pain as a result of heat stress.[D] Several hot days are considered a heat wave.[E] So does extreme heat.[F] Doctors say people can do many things to protect themselves from the dangers of extreme heat.[G] Heat can be both beneficial and dangerous.
单选题Which of the statements listed concerning heat transfer is correct?()AHeat is always transferred at a constant rateBHeat transfer rate increases as temperature difference increasesCThe rate of heat transfer is not affected by temperature differenceDThe high temperature region is known as a heat sink
单选题The rate of heat transfer from a hot region to a cold region is affected most by the ().Asize of the heat sinkBtemperature difference between the regionsCsize of the heat sourceDtotal heat of the system
单选题Which of the following statements is correct concerning heat transfer?()AHeat is given off from a high temperature region known as a heat sinkBHeat transfer rate is affected most by the size of the heat sink involvedCHeat transfer rate is affected most by the temperature difference between the heat source and the heat sinkDHeat transfer by radiation will occur only by mass motion of a fluid substance
单选题The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().Aremain constant along the tubes lengthBbe greatest in a single pass counter flow heat exchangerCremain constant throughout the heat exchangerDvary from section to section through out the heat exchanger
单选题The reason why the laser beam is very strong is that ______.Ait is artificially illuminatedBit is made up of a concentrated beam of lightCit sends out heat in all directionsDits heat is increased by the heat of the sun
单选题The purpose of designing some waste heat boilers with sinuous fire tubes, is to()Aincrease exhaust gas velocity through the boilerBreduce accumulations of carbon deposits on the heat transfer surfacesCeliminate exhaust gas pulsations and noiseDincrease the rate of heat transfer to the waterside
单选题Which of the following is true of the heating system of the Johnstown campus?AThe heat is supplied by human bodies only.BThe heat is supplied by both human bodies and other heat-emitting objects.CThe heat is supplied by both human bodies and conventional fuel.DThe heat is supplied by human bodies, other heat-emitting objects, and conventional fuel.
单选题The heat identified by only a change in temperature is known as ().Asensible heatBlatent heatCtotal heatDresidual heat
单选题The heat used to change a liquid to a vapor is called ().Alatent heat of fusionBlatent heat of vaporizationCspecific heat of vaporizationDlatent heat of the gas
单选题The amount of heat released by steam when it changes to water at the same temperature is called().Alatent heat of condensationBlatent heat of vaporizationClatent heat of saturationDsensible heat of condensation
单选题When using a high-velocity fog stream in a passageway,the possibility of a blow back must be guarded against. Blow back is most likely to occur when().Apressure builds up in the nozzle which causes a surge of waterBthe only opening in a passageway is the one from which the nozzle is being advancedCpressure in the fire hose drops below 100 psiDa bulkhead collapses due to heat and pressure
单选题Sacrificial zinc anodes are used on the saltwater side of diesel engine heat exchangers to().Areduce electrolytic action on heat exchanger metalsBkeep heat transfer surfaces shiny and cleanCprevent rapid accumulation of marine growthDprovide a protective coating on heat exchanger surfaces