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排气门在排气行程上止点之后关闭，从上止点到排气门关闭曲轴转过的角度称为 。
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在发动机正时皮带时，曲轴与凸轮轴所有的标记都对齐时，说明一缸处于压缩上止点状态。
发动机附件皮带在进行安装时，其张紧力越大越好，可以将较大的力传递给其他附件。
在安装发动机凸轮轴时，应逐步拧紧凸轮轴轴承盖螺栓，慢慢将凸轮轴压到安装位置。
1. Listen to the dialogues and fill in the blanks.[音频]Dialogue 1(W=waiter C=customer)C: Hi, waiter. Can you ①________ over here?W: Of course. What’s the ②___________, sir?C: Can you make out what this is?W: Oh my god. I think that’s a cockroach.C: So there’s ③____________wrongwith my eyes.W: I’m terribly sorry. We will replace the dish and refund your ④_________.C: Good. That will help me calm down a little.Dialogue 2(W=waiter C=customer)W:Good evening, sir. Do you have a reservation?C:Well, I’m afraid not.W:I’m very sorry. There are no tables ⑤____________ now. Would you mind waiting for a minute?C:No. I don’t mind.W:Do you prefer the smoking or the non-smoking ⑥_________, or whatever comes first?C:Whatever comes first.W:OK, please take a seat.(15 minutes later)W:Sorry to keep you waiting, sir. Now we have tablesavailablein the non-smokingsection. This way, please.C:Thank you. Can you ⑦_________ the menu, please?W:Here it is. Are you ready to ⑧__________ now?C:Yes. What kind of drink do you have for an aperitif?W:I recommend red wine.C:Then a glass of red wine. What is the specialty of the house?W:Lobster, sir.C:How is that cooked?W:It is steamed and served with our special sauce. It’s the most ⑨_________ dish here.C:Then I think I will try it. And I want some green salad.W:What kind of dressing(沙拉调料)would you like? We have French and Italian.C:French, please.W:OK. Anything else?C:No, that’s all for tonight.W:OK. Just a moment, sir.
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