油封的密封一种状态是油封的唇边较尖,呈三角形,与转轴的接触压力呈三角形分布,油膜呈楔

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问题:

油封的密封一种状态是油封的唇边较尖,呈三角形,与转轴的接触压力呈三角形分布,油膜呈楔形且很薄,为()润滑状态,其密封性能最佳。

A、流体

B、液体

C、固体

D、边界

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用it, that, this或者one完成句子。

1. The Parkers bought a new house but ____ will need a lot of work before they can move in.

2. I hate ____when people talk with their mouths full.

3. The chairman thought _____necessary to invite Professor Smith to speak at the meeting.

4. I like____ in the autumn when the weather is clear and bright.

5. — I saw no more than one motor-car in that shop. Will you go and buy ____?

    — No, I'd rather find _____ in other shops.

6. I want to know _____: Has Mr. Jones been here the whole morning?

7. It is what you do rather than what you say ____ matters.

8. — Did you find your pen yesterday?

    — No, I didn't find ____. But I've bought ____.

9. — Excuse me, I want to have my watch fixed, but I can't find a repair shop.

    — I know___ nearby. Come on, I'll show you.

10. It is the ability to do the job _____ matters not where you come from or what you are.

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把10克盐放入90克的水中,盐占盐水的(  )
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下列项目中属于长期负债的是()。

A.长期投资

B.应付债券

C.本年折旧

D.应交税金

题型:单项选择题

采用多芯电缆的芯线作PEN线干线,其截面应不小于()。

A.2.5mm2

B.4mm2

C.6mm2

D.16mm2

题型:单项选择题

下列叙述中正确的是【 】。

A.每个C程序文件中都必须要有一个main()函数

B.在C程序中 main()函数的位置是固定的

C.C程序中所有函数之间都可以:相互调用,与函数所处位置无关

D.在C程序的函数中不能定义另一个函数

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