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
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
A salinity indicator is used to determine the （）.