用括号内所给词的适当形式填空。

1. Linda and I______(be) good friends.

2. My father is a teacher.______(his) is 36 years old.

3.I have two English______(dictionary).

4.—______(be) these your pens?

   —Yes, they are.

5. These are my______(friend).

高压开关柜弹簧机构手动可以储能，电动刁二能储能，应该是（）故障

A.机械

B.操作

C.电气

D.机械和电气