在数控机床运行中不得随意修改（）。
A.程序
B.数据
C.指令
D.参数
参考答案：D
用所给词的适当形式填空。
1. His favorite food is ________ (potato).
2. Would you like ________ (have) some beef ?
3. We'd like three _________(bowl) of noodles.
4. I'd like some mutton ________ (eat).
5. The boy likes ________ (have)some bread and milk for breakfast.
请准确说出红军时期、抗日战争时期和解放战争时期所指的具体时间段？
