题目内容
发动机异响主要有 、 、空气动力异响和电磁异响等。
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发动机异响的主要影响因素是、、和润滑条件。
发动机在怠速或低速运转时，在气缸的伤部发出清晰而明显的“嗒嗒嗒”的金属敲击声，而中速以上运转时响声减弱或消失是活塞销响的现象之一。
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。
[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.
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