A.throttling the pressure line
B.changing the speed of the piston
C.either A or B
D.None of the above is tree
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A.throttling the pressure line
B.changing the speed of the rotor
C.either A or B
D.None of the above is tree
A.kinetic；pressure
B.kinetic；essential
C.pressure；kinetic
D.pressure；height
A.throttling the pressure line
B.changing the speed of the rotor
C.either A or B
D.None of the above is tree
A.reciprocating pumps
B.positive displacement pumps
C.centrifugal pumps
D.centripetal pumps
A.positive displacement
B.ejector
C.centrifugal
D.air compressor
最新試題
Which of the listed pumps is NOT a positive displacement pump?（）
Thermostatic expansion valves can be adjusted for （）.
The major source of chemical contaminants in hydraulic fluid is （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.