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单选题
Freon( )。
A
B
C
D
E
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The effect that exhaust gas recirculation can reduce NOX formation is partly due to a reduction of the()concentration in the combustion zone and partly due to the content of water and carbon dioxide in the exhaust gas.A.OxygenB.NitrogenC.SulphurD.Freon
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WhichofthefollowingisusedinanIBMBladeCentertoprovidecooling?()
A.FansforeachbladeB.ChilledWaterC.BlowersD.Freon
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氟利昂(Freon)是一系列氯氟化合物的商品名称。自然界中没有氟利昂.它是人工合成的有机化合物.由氯、氟、碳等原子组合而成,是无色、无味、无毒的惰性气体.在20世纪被广泛应用于工业生产.为经济发展和生活改善作出了很大贡献。20世纪后期。氟利昂对大气臭氧层的破坏作用被广泛重视.在生产领域逐渐被其他物质所代替.如“无氟冰箱”的推广。氟利昂中对臭氧造成损害的主要元素是 。( )
A. 氟
B. 氯
C. 碳
D. 硫
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Which of the following is used in an IBM Blade Center to provide cooling?()A、Fans for each bladeB、Chilled WaterC、BlowersD、Freon
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单选题The average of a, b, c, d, and e is 28. If the average of a, c, and e is 24, what is the average of b and d?A
31B
32C
33D
34E
36
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单选题In a centrifugal Freon refrigeration system, the overall capacity of the system is increased by()A
opening more bypass linesB
opening additional expansion valvesC
adding refrigerantD
speeding up the machine
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单选题If liquid freon should come in with your skin, you should ()A
wash with salt waterB
wash with sterile mineral oilC
treat it like frostbiteD
treat it like any burn
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单选题Freon 12 which is used to produce intense cold is normally a () when at atmospheric pressure and temperature.A
liquidB
gasC
solidD
water only
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单选题The function of () in a refrigeration plant using Freon is to move moisture from all refrigeration system.A
filterB
filter drierC
heat exchangerD
air cooler
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单选题If no gaskets are used in the piping joints of a Freon system, the joints must be()A
finished jointsB
welded jointsC
ground jointsD
soldered joints
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