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單項(xiàng)選擇題

The amount of moisture in a given sample of air, when compared with the amount of moisture the air could hold if totally saturated at the existing temperature of the sample, is called （）.

A.absolute humidity
B.specific humidity
C.effective humidity
D.relative humidity

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單項(xiàng)選擇題

The purpose of an air compressor unloading device is to （）

A.drain water from the air receiver
B.drain water from the cylinders
C.delay the compression process until the motor is up to speed
D.check pump alignment

單項(xiàng)選擇題

Personnel working with refrigeration systems, and subject to the exposure of refrigerants should wear （）.

A.face shield
B.a respirator
C.rubber gloves
D.an all purpose gas mask

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