问题
问答题 简答题
拟订工艺过程的三先三后的原则是什么？
答案
参考答案：
先基准表面，后一般表面
先主要表面，后次要表面
先粗加工，后精加工。
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拟订工艺过程的三先三后的原则是什么？
参考答案：
先基准表面，后一般表面
先主要表面，后次要表面
先粗加工，后精加工。
| 完形填空。 | |||
| Doctors tell us holidays are important. We should have a rest from l for a week or two weeks every year.If it is possible, they say, we should 2 our homes and go to another 3 of the country. We should go away for 4 . Then,after the holidays,we will be 5 and get ready for 6 again. But some people didn't want 7 their homes to stay in other places. They don't like a sudden change(突然变化)in their lives (生活). They like their homes 8 of all. And some people can have a rest in 9 way. They can go to visit their friends. They can have 10 holidays together. | |||
| ( )1. A. work ( )2. A. stay ( )3. A. city ( )4. A. work ( )5. A. worse ( )6. A. work ( )7. A. to go ( )8. A. better ( )9. A. one ( )10.A. better | B. duty B. leave B. town B. study B. healthy B. sports B. to come B. best B.other B. best | C. play C. go C. village C. holidays C. bad C. study C. to stay C. well C. another C. well | D. doing D. come D. part D. sports D. best D. play D. to leave D. good D. others D. good |