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单选题
The process that occurs when heat is generated by a chemical reaction within a substance and continues to a point of ignition is known as （）.
A
chemical ignition
B
spontaneous combustion
C
chemical combustion
D
radiation ignition
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Chemical energy can ________ heat energy.
A.become intoB.grow upC.be changed intoD.be covered with
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According to the passage, which of the following statement is not true?A.the heat exchanging surfaces should be kept substantially cleanB.the heat exchanger flow passages should be clear of obstructionC.seals for the plate heat exchanger needs to be renewed oftenD.the cleaning process of the plate heat exchanger should be done following our experiences only
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The fire extinguishing action of CO 2 comes mostly from ______.A.breaking the fire chemical chain reactionB.smotheringC.coolingD.isolating the heat from the fuel
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Spontaneous combustion is caused by ______．A.An outside heat source heating a substance until it ignitesB.Conduction of heat through a wall of material to the substanceC.Chemical action within a substanceD.All of the above
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When cleaning a tank by the Butterworth process，you should begin to pump out the slops ______．A.At the end of the drop scheduleB.When the process is startedC.When the process is finishedD.When the tank is clean
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A portable dry chemical fire extinguisher discharges by ______.A.gravity when the extinguisher is turned upside downB.pressure from a small CO2 cartridge on the extinguisherC.air pressure from the hand pump attached to the extinguisherD.pressure from the reaction when water is mixed with the chemical
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In the process,the light energy converts to heat energy.A:changes
B:drops
C:reduces
D:leaves
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共用题干
第二篇Night of the Living AntsWhen an ant dies,other ants move the dead insect out of the nest.This behavior is interesting to scien-tists,who wonder how ants know for sure一and so soon一that another ant is dead.Dong-Hwan Choe,a scientist at the University of California,found that Argentine ants have a chemical on the outside of their bodies that signals to other ants,"I'm dead一take me away."But there's a twist to Choe's discovery. These ants behave a little bit like zombies（僵尸）.Choe says that the living ants一not just the dead ones一have this death chemicals. In other words,while an ant crawls around,perhaps in a picnic or home,it's telling other ants that it's dead.What keeps ants from hauling away the living dead? Choe found that Argentine ants have two additional chemicals on their bodies,and these tell nearby ants something like,"Wait一I'm not dead yet."So Choe's research turned up two sets of chemical signals in ants:one says,"I'm dead,"the other set says,"I'm not dead yet."Other scientists have tried to figure out how ants know when another ant is dead.If an ant is knockedunconscious,other ants leave it alone until it wakes up.That means ants know that unmoving ants can still be alive.Choe suspects that when an Argentine ant dies,the chemical that says"Wait一I'm not dead yet"quickly goes away. Once that chemical is gone,only the one that says"I'm dead"is left."It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard（墓地）,not because its body releases new,unique chemicals after death,"said Choe.When other ants detect the"dead"chemical without the"not dead yet" chemical,they haul away the body. This was Choe's hypothesis（假设）.To test his hypothesis,Choe and his team put different chemicals on Argentine ant pupae（蛹）.When the scientists used the"I'm dead"chemical,other ants quickly hauled the treated pupae away.When the sci-entists used the"Wait一I'm not dead yet"chemical,other ants left the treated pupae alone.Choe believes this behavior shows that the" not dead yet" chemical overrides（优先于）the" dead" chemical when picked up by adult ants.And that when an ant dies,the"not dead yet"chemical fades away.Other nearby ants then de-tect the remaining"dead"chemical and remove the body from the nest.According to Choe's hypothesis,_______________.A:an ant still smells like a living one when it diesB:the"I am dead"chemical leaves the ant's body when it diesC:the"I am not dead yet"chemical is left when an ant diesD:the"I am not dead yet"chemical quickly goes away when it dies
考题
The best statement of the main idea of this passage is that__________.A.scientists have found a way to prolong the period of clinical death
B.biological death occurs when vital organs have suffered permanent damage
C.modern scientists divide the process of dying into clinical and biological death
D.cooling delays the processes leading to biological death
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B.Mutex
C.Deadlock
D.Schedule
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Which of the following statements about cooling is true？（）A、Adapter cards （e.g. modems） do not add to the heat generated in a computer case.B、Bus mastering reduces the amount of heat generated inside a computer case.C、Removing expansion slot covers can compromise cooling airflow design.D、Periodic cleaning of the computer components inside the case has no effect on cooling efficiency.
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You are maintaining your OLTP database in Oracle10g. You have not set the warning level and critical level threshold values for space usage of the DATA1 tablespace. What will be the impact？（）A、 No warning level or critical level alert will be generated.B、 A warning level alert will never be generated， but a critical level alert will be generated when 97 percent space of the DATA1 tablespace is used.C、 A critical level alert will never be generated， but a warning level alert will be generated when 85 percent space of the DATA1 tablespace is used.D、 A warning level alert will be generated at 85 percent space usage of the DATA1 tablespace， and a critical level alert is generated at 97 percent space usage of the DATA1 tablespace.
考题
单选题The heat generated by a fire will be transferred through a bulkhead or dock, as a result of （）.A
conductionB
radiationC
convectionD
advection
考题
单选题The chemical instructor told the students that heat is _____ whenever certain chemicals are mixed together.A
circulatedB
producedC
engagedD
modified
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单选题What is likely to occur when you are surging synthetic mooring lines on the gypsyhead during mooring operations?（）A
The lines may jam and then jump off the gypsyheadB
If there is sudden strain on the line，the man tending the line may be pulled into the gypsyheadC
The lines' surging may cause the vessel to surgeD
The heat generated may cause the lines to temporarily fuse to the gypsyhead
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单选题Which of the following will help dissipate heat through the heat sink when upgrading a CPU? （）A
Case fanB
Thermal compoundC
Motherboard riserD
Power supply
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单选题Less scale formation occurs in a flash evaporator than in a submerged tube evaporator because （）.A
the distillate produced has greater purityB
no boiling occurs on heat transfer surfacesC
evaporation occurs at a higher rateD
the incoming feed is at a higher temperature
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单选题Too much excess air is （）because the heat generated is being lost through the exhaust trunking instead of being made used of in heating the water to produce steam.A
not goodB
goodC
betterD
the best
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问答题Chemistry is the study of the behavior and composition of matter. All foods aremade up of chemical substance which undergoes chemical changes when cooking 1．______in an oven or digested within the body. The cooking of meat and vegetables induce 2．______chemical changes, making it more delicious; similarly the leavening action of 3．______baking powder is a straightforward chemical change, as is the conversion ofstarch into sweet sugars by digestion.Cookery is a science requiring a knowledge of chemistry. 4．______This is evident from the variety of cooking products and food additives availableas cooking oils, fats, colorings, sweeteners, tenderizers, flavorings, screamingagents, preservatives, etc. Each is carefully prepared before painstaking 5．______research. It is therefore essential for trained cookers to understand 6．______chemical science in order to appreciate the chemistry nature of foods 7．______and the changes achieving on cooking. Homeworkers should also 8．______know cleansing agents and textiles used in the home and how the latter 9．______responds to the effects of heat, light, water, and chemical cleansing agents. 10．______
考题
单选题The amount of heat released by steam when it changes to water at the same temperature is called（）.A
latent heat of condensationB
latent heat of vaporizationC
latent heat of saturationD
sensible heat of condensation
考题
单选题A portable dry chemical fire extinguisher discharges by（）.A
gravity when the extinguisher is turned upside downB
pressure from a small CO2 cartridge on the extinguisherC
air pressure from the hand pump attached to the extinguisherD
pressure from the reaction when water is mixed with the chemical
考题
单选题The energy consumed by an AC motor, as strictly reactive power, is （）A
used to do mechanical workB
used to establish the magnetic field of the motorC
lost as heat generated by the windingsD
lost in doing work to turn the motor itself
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单选题Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the （）A
electronic ignition systemB
compression of air by the pistonC
friction in the fuel injectorD
fuel oil bearing system
考题
单选题The fire extinguishing action of CO2 comes mostly from （）.A
breaking the fire chemical chain reactionB
smotheringC
coolingD
isolating the heat from the fuel
考题
填空题During the process of “burning” ATP, your muscles need to eliminate heat.____
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