题目内容
造成点火敲击响的主要原因是发动机爆燃，其次也可能是早燃。
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[音频]M: Excuse me. Have they started boarding for the 1.____to London?W: Flight BA 2.____ to London, sir?M: Yes, ma’ am. When can passengers begin to board? I have been waiting here for quite a while.W: I’m sorry. But this flight is 3.____.M: What? It is delayed? How come we got no 4.____?W: I’m very sorry for the inconvenience. 5.____ ago there was announcement. The flight is delayed 6.____ a sudden ____.M: How 8.____ will we have to wait?W: I’m terribly sorry, but I really don’t know for 9.____ now. I’ll keep you 10. ____ as soon as possible.
发达市场经济国家不同的市场经济模式，主要取决于与市场关系的不同组合
水利水电工程按其规模、效益和在国民经济中的重要性划分为（ ），工程中的水工建筑物根据所属工程等别及其在工程中的作用和重要性划分为（ ）。
高度超过()m的坝属于高坝。
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