机械加工中，常用试切法来保证（）加工精度。
A、位置
B、尺寸
C、形状
D、形位
参考答案：B
按要求转换下列句式，每空一词。
1. Peter has an interesting book. (改为一般疑问句)
_____ Peter_____ an interesting book?
2. Jenny likes milk for breakfast. (改为否定句)
Jenny_____ _____ milk for breakfast．
3. My new T-shirt is white. (对划线部分提问)
_____ is your new T-shirt?
4. What’s the price of the bag? (改为同义句)
_____ _____ is the bag?
5. Can the boy play computer games?(作否定回答)
No, _____ _____.
三级预防
