问题
单项选择题
为使金属工件符合设计所要求的形状和粗糙度，往往需要进行挫削和检查工作面的垂直度。下列是有关挫削和用90°角尺检查工作面垂直度的图示，其中操作正确的是（）。
A.①③
B.②③
C.①④
D.②④
答案
参考答案：C
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为使金属工件符合设计所要求的形状和粗糙度，往往需要进行挫削和检查工作面的垂直度。下列是有关挫削和用90°角尺检查工作面垂直度的图示，其中操作正确的是（）。
A.①③
B.②③
C.①④
D.②④
参考答案：C
| 选用所给句子完成对话。 | |
| A: 1 What did you do today? B: We planted trees just now. A: Oh, I have remembered. 2  where did you work?B: At the foot of the hill. A: The one on the other side of the river. B: How did you get there? B: On foot. 3 . A: But what made your clothes so dirty? B: I fell into the river when I was carrying some water. A: Bad luck! You’d better go to see a doctor B: 4 The river isn’t deep and only my shoes are wet through. A: 5 . B: Thanks a lot. I’ll  do.
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