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
单项选择题 If the pump for a hydraulic anchor windlass is overheating, the cause may be （）.
单项选择题 Refrigerant enters the condenser as a （）.
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 （）.
