零件在加工、装配过程中，用来作为依据的那些点、线、面称为（）。
参考答案：工艺基准
根据首字母及句意补全单词
1. Tom was happy to get Cheng Long's a_____.
2. Li Ming is very popular in our class, so he becomes our m_____.
3. It was my birthday yesterday. My mother gave me a beautiful g_____.
4. Do you like staying in the house or o_____?
5. -Did the children go out?
-No, they are playing in the y_____.
软磁盘硬塑料套上的矩形缺口的作用是________。
A．写保护
B．美观
C．机械定位
D．零磁道定位
