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听力原文:M: Good morning. Can I help you?W: Hello. My name's John Bush and I'm intending t

听力原文:M: Good morning. Can I help you?

W: Hello. My name's John Bush and I'm intending to go to a conference in Sydney for three weeks.

M: I see. Do you want the excursion fare or the full return fare?

W: Now, can I get a stopover on an excursion fare?

M: Yes, you're allowed only one stopover on the excursion fare.

W. Oh, I see, only one.

M: Yes. But of course, if you pay the full return fare then you can have unlimited stopovers.

W: Oh, It sounds good. You see, the thing is that I've got two weeks' holiday after the conference and I've never been out that way before at all to Australia or the Far East, and I want to go shopping or sightseeing in Hong Kong or somewhere near there. Where exactly can I go?

M: Well, lots of places. There's Singapore, Kuwait, Athens, you've really got quite a lot of choices you know.

W: Mm. Well, it sounds marvelous. How much would that cost? How much is the full fare?

M: The full fare? Well, that's really quite a lot. It's £1204.

W: Yes. Well, it's once in a lifetime, you know, I've never been. The thing is actually that I'm absolutely afraid of flying. I've never done it before.

M: Oh dear. Um...

W: And I'm hoping that I can persuade my two Mends, who are going to the conference, to stop over with me on the way back.

M: Yes, that would be a good idea.

W. By the way, one of them is in Cairo at the moment. Would it be possible for me to stop over there on my way to Sydney?

M. Yes, of course. There are lots of flights to Cairo and, then plenty more onwards from Cairo to Sydney. And then you can stay for as long as you like.

W: Oh, that's great! Now, the thing is, I think I'd better go and persuade Mr. Adams that, you know, he'd like to stop with me in Cairo...

M: I see.

W: Oh, thanks very much. Good-bye.

M: Thank you. Good-bye.

What is Mr. Bush's main purpose of the trip?

A.Sightseeing in Australia and the Far East.

B.Visiting a friend in Cairo.

C.Attending a conference in Sydney.

D.Shopping in Hong Kong.

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第1题

把钢加热到临界点(Ac3,Acm)以上30~50℃,使其全部奥氏体化,然后在空气中冷却,从而得到珠光体型组织

把钢加热到临界点(Ac3,Acm)以上30~50℃,使其全部奥氏体化,然后在空气中冷却,从而得到珠光体型组织的热处理叫做()。

A.回火

B.淬火

C.退火

D.正火

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第2题

把钢加热到铁-碳相图Ac3(亚共析钢)、Acm(过共析钢)以上30~50℃,保温一定时间,随后在空气中冷却的工艺过程叫()。
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第3题

正火加热温度是()。

A.Ac3(对于亚共析钢)和Acm(对于过共析钢)以上30~50℃

B.Ac3(对于过共析钢)和Acm(对于亚共析钢)以上30~50℃

C.Ac1(对于亚共析钢)和Ac3(对于过共析钢)以上30~50℃

D.Ac1(对于过共析钢)和Ac3(对于亚共析钢)以上30~50℃

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第4题

钢的淬火是将钢加热到()以上某一温度,保温一段时间,使之全部或部分奥氏体化,然后以大于临界冷却

钢的淬火是将钢加热到()以上某一温度,保温一段时间,使之全部或部分奥氏体化,然后以大于临界冷却速度的冷速快冷到Ms 以下(或Ms 附近等温)进行马氏体(或贝氏体)转变的热处理工艺。

A.临界温度Ac3(亚共析钢)或Ac1(过共析钢)

B.临界温度Ac1(亚共析钢)或Ac3(过共析钢)

C.临界温度Ac2(亚共析钢)或Ac2(过共析钢)

D.亚共析钢和过共析钢都取临界温度Ac3

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第5题

()将钢加热到Ac3(亚共析钢)或Acm(过共析钢)以上30℃~50℃,保温一段时间后,取出炉外在静止的空气中冷却的方法,称为

A.正火

B.完全退火

C.淬火火

D.调质

点击查看答案

第6题

钢的淬火时将钢加热到以上某一温度,保温一段时间,使之全部或部分奥氏体化,然后以大于临界冷却速度的冷速快冷到Ms以下(或Ms附近等温)进行马氏体(或贝氏体)转变的热处理工艺()

A.临界温度Ac3(亚共析钢)或Ac1(过共析钢)

B.临界温度Ac1(亚共析钢)或Ac3(过共析钢)

C.临界温度Ac2(亚共析钢)或Ac2(过共析钢)

D.亚共析钢和过共析钢都取临界温度Ac355

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