A.absolute humidity
B.relative humidity
C.specific humidity
D.total humidity
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A.excessive pump speed
B.excessive suction head
C.worn wearing rings
D.gross pump misalignment
A.Distillation is the process of boiling seawater to produce vapor which is condensed into fresh water
B.Evaporation is the second part of the distillation process where brine is removed
C.Brine is the result of condensed sea water vapor
D.Distillate is the product resulting from the evaporation of fresh water vapor
A.absolute humidity
B.specific humidity
C.effective humidity
D.relative humidity
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
A.face shield
B.a respirator
C.rubber gloves
D.an all purpose gas mask
最新試題
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
Thermostatic expansion valves can be adjusted for （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A grease gun is generally used to lubricate a （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.