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單項(xiàng)選擇題

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

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單項(xiàng)選擇題

We use （） to distill fresh water from sea water.

A.engine
B.sea water pump
C.cylinder cooler
D.fresh water generator

單項(xiàng)選擇題

In the condenser, the hot, high pressure refrigerant gas is cooled by the sea water and becomes（）.

A.fresh water
B.vapor
C.mixture
D.liquid