网友您好, 请在下方输入框内输入要搜索的题目:

题目内容 (请给出正确答案)
单选题
Changing from solid to liquid, water takes in heat from all substances near it, and this _____ produces artificial cold surrounding it.
A

absorption

B

transition

C

consumption

D

interaction


参考答案

参考解析
解析:
句意:从固体变成液体的过程中,水从它周围的物质中吸收热量,而这一吸收过程又向周围产生了冷气。absorption吸收。transition传递,过渡。consumption消耗;消费。interaction相互作用。
更多 “单选题Changing from solid to liquid, water takes in heat from all substances near it, and this _____ produces artificial cold surrounding it.A absorptionB transitionC consumptionD interaction” 相关考题
考题 CSometimes, the simplest ideas are the best. For example, to absorb heat from the sun to heat water, you need large, flat, black surfaces. One way to do that is to build those surfaces specially, on the roofs of buildings. But why go to all that trouble when cities are full of black surfaces already, in the form. of asphalt (柏油) roads?Ten years ago, this thought came into the mind of Arian de Bondt, a Dutch engineer. He finally persuaded his boss to follow it up. The result is that their building is now heated in winter and cooled in summer by a system that relies on the surface of the road outside.The heat-collector is a system of connected water pipes. Most of them run from one side of the street to the other, just under the asphalt road. Some, however, dive deep into the ground.When the street surface gets hot in summer, water pumped through the pipes picks up this heat and takes it underground through one of the diving pipes. At a depth of 100 metres lies a natural aquifer (蓄水层) into which several heat exchangers (交换器) have been built. The hot water from the street runs through these exchangers, warming the ground-water, before returning to the surface through another pipe. The aquifer is thus used as a heat store.In winter, the working system is changed slightly. Water is pumped through the heat exchangers to pick up the heat stored during summer. This water goes into the building and is used to warm the place up. After performing that task, it is pumped under the asphalt and its remaining heat keeps the road free of snow and ice.64. Which of the following is true according to the first two paragraphs?A. Arian de Bondt got his idea from his boss.B. Large, flat, black surfaces need to be built in cities.C. The Dutch engineer's system has been widely used.D. Heat can also be collected from asphalt roads.

考题 Of all the extingushing agents listed below, which one has the greatest capacity for heat absorption?______.A.Water fogB.Carbon dioxideC.Dry chemicalD.Solid stream of water

考题 Moisture is removed from a refrigeration system byA.bleeding refrigerant from the condenserB.opening a drain petcock on the oil separatorC.condensing the water in the heat exchangerD.using a dehydrator cartridge

考题 One function provided by a hydraulic accumulator is to ___.A.provide an area where air can separate from the oilB.provide an area to separate solid contaminants from the oilC.act as an oil and water separatorD.absorb shocks occurring in the system

考题 Which of the following is the MOST critical component related to removing heat from the CPU?() A. Vented caseB. Number of fansC. Thermal pasteD. Liquid cooling

考题 Heat exhaustion is caused by excessive ______.A.loss of body temperatureB.loss of water and salt from the bodyC.gain in body temperatureD.intake of water when working or exercising

考题 Which of the following is the MOST critical component related to removing heat from the CPU?()A、Vented caseB、Number of fansC、Thermal pasteD、Liquid cooling

考题 单选题What is the purpose of sub cooling R-12 in the condenser?()A to increase the system efficiency by sensible heat transferB to stop the liquid from flashingC to reduce the load on the compressorD to remove latent heat of vaporization and the suction piping transfer

考题 单选题A fluid coil will () large quantifies of heat when it changes state from a liquid to a vapor.A releaseB absorbC developD regenerate

考题 单选题Before loading bulk grain,bilge wells must be covered to().A add strength to the bilge well strainerB permit rapid flow of water to the bilge wellsC prevent cargo sifting into the bilge wellsD prevent oil,water,or other liquid from reaching the cargo

考题 单选题Water fog from an all-purpose nozzle may be used to().A fight an electrical fireB fight a magnesium fireC eliminate smoke from a compartmentD All of the above

考题 单选题The straight stream capability of an all-purpose nozzle is used in fighting a class A fire to().A shield fire fighters from radiant heatB break up burning materialC get the most water possible on the fireD drive heat and smoke ahead of the fire fighters

考题 问答题Most people would describe water like a colorless liquid. They         (1) _______would know that in very cold conditions it becomes a solid calledice and that when heating on a fire it becomes a vapor called steam.       (2) _______However, water, they would say, is a liquid. We have learned thatwater consists of molecules composed with two atoms of hydrogen          (3) _______and one atom of oxygen, which we describe by the formula H2O.This is equally true of the solid called ice and the gas called steam.Chemically there is no difference between the gas, the liquid, andthe solid, all of which is made up of molecules with the formula H2O.       (4) _______This is true of other chemical substances; most of them can exist asgases or as liquids or as solids. We may normally think of iron as asolid, but if we will heat it in a furnace, it will melt and become a       (5) _______liquid, and at very high temperatures it will become a gas. Nothingvery permanent occurs when a gas changes into a liquid or a solid.Everyone knows that ice, which has been made by freezing water,can be melted again by warmed and that steam can be condensed           (6) _______on a cold surface to become liquid water. In fact, it is only becausewater is so a familiar substance that different names are used for        (7) _______the solid, liquid and gas. Most substances are only familiar with         (8) _______us in one state, because the temperatures requiring to turn them         (9) _______into gases are very high, or the temperatures necessary to turn theminto solids are so low. Water is an exception in this respect, whichis another reason why its three states have given three different        (10) _______names.

考题 单选题One function provided by a hydraulic accumulator is to()A provide an area where air can separate from the oilB provide an area to separate solid contaminants from the oilC act as an oil and water separatorD absorb shocks occurring in the system

考题 单选题Moisture is removed from a refrigeration system by().A bleeding refrigerant from the condenserB opening a drain petcock on the oil separatorC condensing the water in the heat exchangerD using a dehydrator cartridge

考题 问答题Practice 1  Heat loss by sweating depends on the fact that when a liquid evaporates, it absorbs an enormous quantity of heat from its surroundings. Therefore, when I am of sweat evaporate, a great deal of heat is absorbed from the surface of the body in contact with it. 1______  2______ The first is the amount of movement of air surrounding the body. The second is the amount of water vapor in the air that surrounds the body.  3______ For this reason, sweat evaporates very rapidly on windy days, and the rate of heat loss by sweating is much more than on a still day. This accounts for the fact that hot still days are much less comfortable than hot windy days. In contrast, the sweat evaporates very rapidly on hot windy days, and cools the body quickly and effectively.  4______ When air is carrying the maximum amount of water vapor that it can hold, it is said to be 100% saturated with water vapor. The relative humidity of the air is said to be 100%. Under these conditions the air cannot carry any water, so no water can evaporate. When the relative humidity is high, therefore, sweat cannot evaporate. Instead, it forms large drops and runs off your skin without cooling you.  5______ It is obvious that under these conditions, evaporation will be much more rapid. Therefore, sweating will be much more effective as a method of losing heat from the body. On a hot dry day, sweat evaporates as soon as it is formed, and you feel reasonably cool even though the temperature of your environment is very high.[A] When the air is very dry and carries no water at all, the relative humidity is said to be 0%.[B] The second factor is the amount of water vapor in the air-the humidity.[C] Hot windy days are much more comfortable than hot still days.[D] This heat transfer occurs even if the environment is hotter than the body.[E] When air moves over the surface of water, the amount of evaporation is greatly increased.[F] You might expect the highest incidence of a heat stroke when the maximum temperature is 100 and humidity is 50%.[G] Two factors affect the rate of evaporation of sweat, and therefore the effectiveness of sweating as a method of cooling the body.

考题 单选题The heat required to change a substance from a solid to a liquid while at its freezing temperature, is known as the latent heat of ().A fusionB vaporizationC condensationD sublimation

考题 单选题In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the ()A raw water pump dischargeB expansion tank outletC cooling water heat exchangerD outlet engine jacket water outlet

考题 单选题A definite advantage of using water as a fire extinguishing agent is its characteristic of().A alternate expansion and contraction as water in a liquid state becomes a vaporB absorption of smoke and gases as water is converted from a liquid to a vaporC rapid contraction as water is converted from a liquid to a vaporD rapid expansion as water absorbs heat and changes to steam

考题 单选题In motor ship, () is often used to recover some of the heat carried in the exhaust gases from the main engine.A an diesel oil heaterB a waste heat boilerC a fresh water generatorD all the above

考题 单选题The heat required to change a substance from a liquid to a gas without experiencing a temperature change is defined as the latent heat of ().A fusionB vaporizationC sublimationD condensation

考题 单选题While troubleshooting a refrigeration system for low head pressure, liquid refrigerant flooding back from the evaporator is determined to be the causeIt may be necessary to ().A change the expansion valve adjustmentB readjust the water regulating valve to increase the flow of waterC purge air from the condenserD clean the waterside of the condenser

考题 单选题Physical exertion on the part of a person who has fallen into cold water would().A be the best thing to try if there was no rescue in sightB increase survival time in the waterC increase the rate of heat loss from the bodyD not affect the heat loss from the body

考题 单选题A purge recovery system is used in a centrifugal air conditioning or refrigeration system to ()A purge lube oil from the liquid refrigerantB recover water purged from the systemC separate foul gases from the receiverD purge non-condensable gases without losing refrigerant

考题 单选题What is the principal danger from the liquid in a half full tank onboard a vessel?()A Corrosion from the shifting liquidB Rupturing of bulkheads from the shifting liquidC Loss of stability from free surface effectD Holing of the tank bottom from the weight of the shifting liquid

考题 单选题Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect ()A increase blow-by in all cylindersB incomplete combustion in all cylinderC overloading in all cylindersD insufficient fuel delivery to all cylinders

考题 单选题It is necessary to remove () from the cooling water spaces to improve heat transfer.A limeB frostC scaleD scar