为了保证焊接质量，一般需要在焊件的接边处，预制成各种形状，称

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问题单项选择题

为了保证焊接质量，一般需要在焊件的接边处，预制成各种形状，称为坡口。坡口的（）是为了保证焊件焊透。

A.钝边高度

B.根部间隙

C.坡口角度

D.搭接接头

答案

参考答案：B

听力题

单词拼写：（每小题1分，共10小题，满分10分）

据句意及所给单词首字母或汉语意思完成下列句子。

1. In China Tomb-sweeping Day(清明节) is a day to be in memory of their a____________.

2. Many r____________ people believe the souls of good people will live on after they die.

3. Within the ____________ （有限）time he saved all the trapped people.

4. Thanks to the healthy diet, she has become s_____________ than before.

5. What he did really hurt me badly and I’ll never f_______________ him.

6. Good health depends on a b______________ diet, proper exercise and enough sleep.

7. We should learn to c_______________ theory with practice.

8. To keep fit, the actress often ___________(请教)the doctor about what to eat.

9. R___________ beef is the classic Sunday lunch and must be served with Yorkshire pudding.

10. My sister didn’t say she would visit me, so I was really amazed at her a______________.

判断题

用非定尺寸刀具镗孔时，为提高质量除了采取与定尺寸刀具相同的方法以外，还要保证安装和调整精度。同时应注意镗刀切削合计参数的选定和安装后的角度变化。