单项选择题
In a flash distilling unit, evaporator feed (seawater) first absorbs heat in the （）.
A.vapor feed heater B.air ejector condenser C.saltwater heater D.distillate cooler
单项选择题 An independent bilge suction is required for （）.
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 （）.
