A.Motors
B.Check valves
C.Safety valves
D.Reducing valve
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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
A.the slewing motor
B.the lulling motor
C.the hoisting motor
D.none of the above
最新試題
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 （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
A salinity indicator is used to determine the （）.
A salinity indicator is used to determine the （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
Which of the listed pumps is NOT a positive displacement pump?（）
Thermostatic expansion valves can be adjusted for （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.