隔离开关

下列关系中不属于公务员应该回避的是（）。

A.夫妻关系

B.姻亲关系

C.连襟关系

D.同学关系

根据句意，用括号内所给单词的适当形式填空。

1. Teenagers shouldn't get their ears _____ (pierce).

2. Sixteen-year-olds should not be _____ (allow) to drive.

3. How many magazines can be _____ (borrow) in the library every week?

4. I _____ (agree) with you - I think it's a bad idea.

5. He often plays soccer with his friends instead of _____ (play) computer games at home.

大肠内存在细菌，这些细菌______。

A．对人体有害
B．对人体无害
C．能合成某些维生素
D．能合成某些矿物质

引导手信号与机车出入段进路道岔准备妥当后所显示的手信号方式相同。