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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

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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

單項(xiàng)選擇題

The boiling and condensation points of a refrigerant depend on the （） exerted upon it.

A.temperature
B.pressure
C.velocity
D.heat