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问题 单项选择题 A1型题

不属于固定桥冠内固位体的是（）。

A.两面嵌体

B.三面嵌体

C.多面嵌体

D.针型固位高嵌体

E.桩冠

答案

参考答案：E

解析：固定桥固位体包括冠内固位体、冠外固位体、根内固位体E属于根内固位体，所以E不正确。冠内固位体包括邻合嵌体和高嵌体，所以A、B、C、D正确。故选E。

填空题

根据下列句子及所给单词的首字母，写出各单词的完全形式（每空限填一词）。

1. Be careful. There is a wine b_______ on the table. You might break it.

2. The number after twenty-nine is t________.

3. Have you e________ been to the Great Wall?

4. It's dangerous to d________ a car after you get drunk.

5. Your parents are your f________ and mother.

6. If a dream comes t________, it actually happens.

7. W________ is the coldest season of the year.

8. When snow f________, it comes down from the sky.

9. It's best to water plants either e________ in the morning or late at night.

10. We don't go to the c________ much for movies because we have a video.

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单项选择题

水罐车抽水时，真空表不指示真空度或真空度很小，其原因是（）

A.进水管部分堵塞

B.引水开关未开

C.发动机故障

D.出水开关未关
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