A.positive displacement
B.non-positive displacement
C.mixed-flow
D.axial-flow
您可能感興趣的試卷
你可能感興趣的試題
A.Reciprocating pumps
B.Rotary pumps
C.Centrifugal pumps
D.Gear pumps
A.interlocked
B.interconnected
C.interfered
D.interacted
A.hydraulic steering
B.follow-up steering
C.remote control steering
D.air controlled steering
A.An expansion valve
B.An evaporator
C.A thermostat
D.A condenser
A.servo-motor
B.swash plate
C.plunger
D.cylinder
最新試題
Which of the following statements is correct concerning heat transfer?（）
A grease gun is generally used to lubricate a （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
A pressure drop through the refrigerant liquid line may cause （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
Which of the listed pumps is NOT a positive displacement pump?（）
The general purpose of a heat exchanger is to （）.
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（）.