问题
单项选择题
在镗床上镗削薄壁工件孔时，为了防止工件夹紧变形，夹紧力要（）。
A.均匀
B.尽量小
C.大小一致
D.分散
答案
参考答案：A
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在镗床上镗削薄壁工件孔时，为了防止工件夹紧变形，夹紧力要（）。
A.均匀
B.尽量小
C.大小一致
D.分散
参考答案：A
| 用方框内所给单词的适当形式填空。 | |
2. She _____ all her life to the teaching. 3. He will use the prize money to help pay for his _____. 4. He is very _____ and helps many poor people. 5. The child _____ his mother to read him a bedtime story. |