A.the slewing motor
B.the lulling motor
C.the hoisting motor
D.none of the above
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A.contraction
B.retraction
C.expansion
D.shrinkage
A.Hydraulic pumps
B.Valves
C.Hydraulic cylinders
D.Hydraulic motors
A.the slewing motor
B.the luffing motor
C.the hoisting motor
D.none of the above
A.unusual vibration
B.excessive worn parts
C.abnormal pressure
D.any of the above
A.Relief valve
B.Direction control valve
C.Stop valve
D.Pressure control valve
最新試題
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
The major source of chemical contaminants in hydraulic fluid is （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
A salinity indicator is used to determine the （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A grease gun is generally used to lubricate a （）.
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 （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
The usual symptoms of cavitation in a centrifugal pump is （）.