什么是麻电？如何防止麻电？

Mr. Rochester was mad with Jane, for she never answered when _____________.

A．speaking

B．spoken to

C．spoken

D．speaking to

用“has"或"have"填空。

1. I _____________ a good friend.

2. A mouse _____________ a tail.

3. Li Ming _____________ five books.

4. We _____________ a big classroom.

5. Jenny and I _____________ two pens.

防火目标？

以下哪一项不属于公告栏广告发布技巧( )

A．写一个好标题
B．在相关的类别、地点发布广告
C．注意发布频率
D．文字处理

S700K型电动转辙机外锁闭装置及安装装置尖轨第二牵引点的动程为（）.

A.70mm

B.75mm±5mm

C.117/116mm±3mm

D.165mm±5mm