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当前学科：输气管道设计与管理
题目：
未知类型
爆燃是指燃速以( )传播的爆炸。
A.音速
B.超音速
C.亚音速
D.光速
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推荐知识点:
Write down the numbers of the topic sentences in the following passages.①The bright child is patient. ②He can tolerate uncertainty and failure, and will keep trying until he gets an answer. ③When all his experiments fail, he can even admit to himself and others that for the time being he is not going to get an answer. ④This may annoy him, but he can wait. ⑤Very often, he does not want to be told how to do the problem or solve the puzzle he has struggled with, because he does not want to be cheated out of the chance to figure it out for himself in the future. ⑥Not so the dull child. ⑦He cannot stand uncertainty or failure. ⑧To him, an unanswered question is not a challenge or an opportunity, but a threat. ⑨If he can’t find the answer quickly, it must be given to him, and quickly; and he must have answers for everything.
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