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單項(xiàng)選擇題

More than one stage of evaporation can take place by admitting the sea water into chambers with progressively （） pressure in the flash evaporator.

A.lower
B.higher
C.the lower
D.the higher

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單項(xiàng)選擇題

In the process of （）, liquid changes into gas.

A.evaporation
B.frosting
C.condensing
D.compressing

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