乙醛与空气混合后引起爆炸。爆炸极限为（）(vol)。A 99%B 99.5%C 99.9%D 100% - 查题网

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国家开放大学 / 化工产品生产技术

乙醛与空气混合后引起爆炸。爆炸极限为（）(vol)。
A 99%
B 99.5%
C 99.9%
D 100%

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化工产品生产技术

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题型描述: 阅读理解Have you ever listened to young children talking in the playground? They are always boasting. They say things like, "My Dad's car is bigger than your Dad's, "and "My Mom is smarter than yours." They particularly like to boast about their families.There were three little boys, Harry, Ted and Gavin, who were always boasting. Gavin was the worst. Everything about his family was always the best or the biggest or the most expensive.Whatever the others said, he could always go on better. One day when they were walking to school, Harry said, "My father had a bath twice a week," Ted spoke next. " That's nothing," he said. "Having a bath twice a week is dirty. My father has a bath every day twice a day." Ted looked at Gavin. Now it was his turn. But what could he say? " This time, " Ted thought, " I'm going to win." Gavin didn't know what to say. He couldn't say that his father had a bath three times a day. That was silly. He walked on in silence. Ted smiled at Harry，and Harry smiled back. They were sure that for once they had beaten Gavin. They reached the school gates. Still Gavin said nothing. They went into class. Morning break，lunch time and afternoon break all passed. Still Gavin said nothing. "We've won, " Ted said to Harry, but he spoke too soon. On the way home, Gavin said, "My Dad is so clean that he doesn't have to bathe at all."1、 "He spoke too soon" in the last paragraph means he was wrong. A. TRUE B. FALSE 2、 Ted's father often had a bath twice a day. A. FALSE B. TRUE 3、 Gavin boasted the most. A. FALSE B. TRUE 4、 Harry boasted about the number of times his father had a bath every week. A. TRUE B. FALSE 5、 According to the passage，the meaning of the word "boast" is " to talk big ". A. FALSE B. TRUE统考英语B

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