当实际刀具与编程刀具长度不符时，用（）来进行修正，可不必改变所编程序。
A.左补偿
B.调用子程序
C.半径补偿
D.长度补偿
参考答案：D
用所给单词的适当形式填空。
1. － _________ they _________ (do) their homework in the classroom?
— Yes, they are.
2. There _________ (be) some people in the park.
3. — How much bread do you want?
— I want two _________ (piece) of bread.
4. I find the girl _________ (dance) in the room now.
5. The women are the _________ (children) teachers.
小儿各系统器官发育最迟的是（）
A.生殖系统
B.神经系统
C.泌尿系统
D.脂肪组织
E.肌肉组织
