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單項(xiàng)選擇題

If the pump for a hydraulic anchor windlass is overheating, the cause may be （）.

A.excessive drive motor speed
B.excessive pump discharge pressure
C.too low of a tilting box angle
D.insufficient drive motor speed

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單項(xiàng)選擇題

Refrigerant enters the condenser as a （）.

A.high pressure liquid
B.low pressure vapor
C.high pressure vapor
D.low pressure liquid

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An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the （）.

A.propeller hub
B.lignum vitae
C.shaft packing
D.labyrinth seal

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