怎样确定防冲距？

用所给词的适当形式填空。

1. March 8th is _______ (woman) Day.

2. My brother enjoys _______ (take) a walk with his dog.

3. The bus trip is _______ (relax). 

4. The good news made us _______ (feel) happy.

5. They decided _______ (see) monkeys first.

数控机床的机械原点，也就是______的原点。

A．工件坐标系

B．机床坐标系

C．局部坐标系

D．相对坐标系

81. With the aid of public bids(公开招标) our town government decided to _____ the two villages by a highway.

A．join

B．connect

C．unite

D．Keep

薄荷的药理作用有（）

A.抗病毒

B.杀菌

C.止痛、止痒

D.兴奋中枢神经

E.抗早孕

VHDL程序中的中间信号必须在（）中定义，变量必须在（）中定义。

A.实体；进程

B.结构；体进程

C.进程；进程

D.结构体；结构体