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


您可能感興趣的試卷

你可能感興趣的試題

1.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

2.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

4.單項(xiàng)選擇題If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the ().

A.packing gland
B.mechanical seals
C.lantern rings
D.wearing rings

5.單項(xiàng)選擇題Distilled water from an evaporator may be discharged into a potable water tank ().

A.through a detachable hose connection
B.after passing through an activated charcoal filter
C.after chemical analysis shows it is fit for consumption
D.through a solenoid operated three-way valve