精密夹具装配后进行一次精加工是为了消除定位元件的（）。
A.定位误差
B.变形
C.位置误差
D.尺寸误差
参考答案：C
找出错误并改正。
1. Today is sunday.
2. It my Chinese teacher.
3. Mr Green' birthday.
4. He is 35. This's a new watch.
5. It not is blue. It's yellow.
6. It's very beautiful. It's for she.
下列关于if和else的配对规则描述正确的是( )
A．else总是和前面最远的if配对 B．else总是和前面最近的if配对 C．if和else的配对按程序缩进格式进行 D．else可以和前面所有的if配对
