单项选择题
In the process of （）, liquid changes into gas.
A.evaporation B.frosting C.condensing D.compressing
单项选择题 The designed capacity is 25 tons a day, but the fresh water generator can only （） 22 tons at present.
单项选择题 Clean oil is achieved in a clarifier bowl where the impurities and water collect at the bowl （）.
单项选择题 The fresh water generator produces fresh water （）.
