單項選擇題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

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2.單項選擇題We use () to distill fresh water from sea water.

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

4.單項選擇題The boiling and condensation points of a refrigerant depend on the () exerted upon it.

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

5.單項選擇題Faulty operation of any system is indicated by very definite ().

A.symptoms
B.samples
C.traces
D.tracks

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