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
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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 -
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The boiling and condensation points of a refrigerant depend on the （） exerted upon it.
A.temperature
B.pressure
C.velocity
D.heat -
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Faulty operation of any system is indicated by very definite （）.
A.symptoms
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