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單項(xiàng)選擇題

The designed capacity is 25 tons a day, but the fresh water generator can only （） 22 tons at present.

A.consume
B.distill
C.run
D.operate

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Clean oil is achieved in a clarifier bowl where the impurities and water collect at the bowl （）.

A.bottom
B.top
C.center
D.periphery

單項(xiàng)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