單項(xiàng)選擇題

Overload protection on hydraulic system is provided by the use of （）.

A.stop valves
B.pressure relief valves
C.balance valves
D.regulating speed valves

在線練習(xí)

你可能感興趣的試題

The most common forms of main drive used on deck auxiliaries are （）.

A.steam plants, electric motors and compressed air
B.diesel engine, hydraulic machinery and compressed air
C.steam plants, electric motors and hydraulic machinery
D.diesel engines, steam plants and hydraulic machinery

單項(xiàng)選擇題

Mooring winches are often combined with （） units so that one prime mover drives both.

A.crane
B.hatch cover
C.windlass
D.steering gear

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