单项选择题
A.bottom B.top C.center D.periphery
The fresh water generator produces fresh water （）.A.by ...
单项选择题The fresh water generator produces fresh water （）.
A.by cooling sea water B.by heating sea water C.by evaporation of sea water D.by purifying sea water
Because of the reduced （） in the vacuum boiling evapora...
单项选择题Because of the reduced （） in the vacuum boiling evaporator, some of the sea water boils as it flows through the tubes.
A.temperature B.water level C.pressure D.rate of flow
We use （） to distill fresh water from sea water.A.engin...
单项选择题We use （） to distill fresh water from sea water.
A.engine B.sea water pump C.cylinder cooler D.fresh water generator
