A.in series
B.in parallel
C.assembled
D.together
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A.gasket
B.packing
C.washer
D.spring
A.Wear
B.Contaminating
C.Coalescence
D.Coarse separating
A.non-pulsating
B.pulsating
C.positive
D.non-positive
A.injection valve
B.relief valve
C.discharge valve
D.inlet filter
A.gear
B.vane
C.screw
D.centrifugal
最新試題
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
Which of the following statements is correct concerning heat transfer?（）
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
Thermostatic expansion valves can be adjusted for （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.