单项选择题
An independent bilge suction is required for （）.
A.ballast tanks
B.sludge tanks
C.machinery space bilges
D.cargo hold bilges
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相关考题
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单项选择题
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 -
单项选择题
Refrigerant enters the condenser as a （）.
A.high pressure liquid
B.low pressure vapor
C.high pressure vapor
D.low pressure liquid -
单项选择题
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
