單項(xiàng)選擇題

Which of the following influences the position of the interface between the liquid seal and the oil in a purifier?（）

A.Height of the machine
B.Temperature of the liquid seal
C.Gravity disc
D.Bowl diameter

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The compressor in an air-cooled condensing refrigeration system is short cycling on the high pressure cutout switch（）

A.system is overcharged with refrigerant
B.system is low on refrigerant
C.discharge valves are leaking excessively
D.discharge valves are leaking slightly

單項(xiàng)選擇題

A cargo hold has been determined to have a relative humidity of 80% and a dry bulb temperature of 80 ℃ and a dry bulb temperature of 85℃.When the hold is sealed and the dry bulb temperature decreases, the relative humidity in the space will （）

A.decrease
B.increase
C.decrease to zero
D.remain unchanged