单项选择题
A.ballast tanks B.sludge tanks C.machinery space bilges D.cargo hold bilges
If the pump for a hydraulic anchor windlass is overheat...
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
Refrigerant enters the condenser as a （）.A.high pressur...
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
An excessive amount of water is prevented from entering...
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
