A.positive displacement
B.non-positive displacement
C.mixed-flow
D.axial-flow
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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 listed pumps is NOT a positive displacement pump?（）
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
A salinity indicator is used to determine the （）.
A pressure drop through the refrigerant liquid line may cause （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
A salinity indicator is used to determine the （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
The general purpose of a heat exchanger is to （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.