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
Low compressor head pressure in a refrigeration system can be caused by（）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
A salinity indicator is used to determine the （）.
The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）
When the steering gear is in operation, you should （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
A grease gun is generally used to lubricate a （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
Which of the following statements is correct concerning heat transfer?（）
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）