A.air cooler
B.economizer
C.injector
D.air blower
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A.to pump off
B.being pumped
C.pumping out
D.it pumping out
A.reciprocating pump
B.gear pump
C.centrifugal pump
D.vane pump
A.reciprocating
B.hydraulic
C.turbine
D.vane
A.a level controller
B.a temperature switch
C.a pressure switch
D.a floating ball
A.a hoisting motor
B.a luffing motor
C.a mooring motor
D.a slewing motor
最新試題
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
A salinity indicator is used to determine the （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
A grease gun is generally used to lubricate a （）.
The general purpose of a heat exchanger is to （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.