A.Hydraulic oil
B.Animal oil
C.Light oil
D.Fuel oil
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A.Motors
B.Check valves
C.Safety valves
D.Reducing valve
A.cargo crane
B.jib
C.safe working load
D.oil pressure
A.dock
B.hold
C.pedestal
D.machinery space
A.the slewing motor
B.the luffing motor
C.the hoisting motor
D.none of the above
A.time
B.space
C.length
D.visibility
最新試題
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
The general purpose of a heat exchanger is to ().
Which of the listed pumps is NOT a positive displacement pump?()
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should ().
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be ().
If the suction pressure at the refrigeration compressor is below normal, the cause can be().
Thermostatic expansion valves can be adjusted for ().
Which of the following statements is correct concerning heat transfer?()
One cause of high head pressure occurring in a refrigeration system can be ().
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()