可动调整法是在装配尺寸链中，选定一个（或几个）零件作为调整环

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问题单项选择题

可动调整法是在装配尺寸链中，选定一个（或几个）零件作为调整环，根据封闭环的精度和电气性能的要求，改变调整环的位置，以保证密封环的精度和（）。

A.物理性能

B.装配精度

C.工艺性能

D.电气性能

答案

参考答案：D

填空题

用所给单词的适当形式填空。

1. My brother is two years _____________ (old) than me.

2. Tom is as _____________ (fat) as Jim.

3. Who is _____________ (thin), you or Helen? Helen is.

4. Does Nancy sing _____________ (well) than Helen? Yes, she does.

5. Which is _____________ (heavy), the elephant or the pig?

6. Whose pencil-box is _____________ (big), yours or hers? Hers is.

7. You have seven books, but I have _____________ (many) than you. I have ten.

8. I jump _____________ (far) than some of the boys in my class.

9. I'm very tall, but she's _____________ (tall) than me.

10. It gets _____________ and _____________ (warm) when spring comes.

单项选择题

栓剂常用的油脂类基质（）

A.PEG

B.PVA

C.β-CYD

D.可可豆脂

E.磷脂