单选题Freon( )。ABCDE
单选题
Freon( )。
A
B
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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
WhichofthefollowingisusedinanIBMBladeCentertoprovidecooling?() A.FansforeachbladeB.ChilledWaterC.BlowersD.Freon
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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
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?A31B32C33D34E36
单选题In a centrifugal Freon refrigeration system, the overall capacity of the system is increased by()Aopening more bypass linesBopening additional expansion valvesCadding refrigerantDspeeding up the machine
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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.AliquidBgasCsolidDwater only
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单选题If no gaskets are used in the piping joints of a Freon system, the joints must be()Afinished jointsBwelded jointsCground jointsDsoldered joints