在常压、100 ℃条件下,把乙醇汽化为蒸气,然后和乙烯以任意比例混合,取其混合气体V L,将其完全燃烧,需消耗相同条件下的氧气的体积是( )A.2V L B.2.5V L C.3V L D.无法计算 答案:解析:乙烯的分子式为C2H4,而乙醇的分子式为C2H6O,可变形为C2H4·H2O,因此,以任意比混合乙烯和乙醇消耗的氧气体积为3V L。答案:C
After the former manager returned from abroad, our company ________ and the production doubled.
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A.came to life
B.came back life
C.recovered to life
D.returned to life