保安接地线应采用截面积符合规定的（）
A.实心铜线
B.编织软铜线
C.硬铝线
参考答案：B
火力发电厂常用的灭火系统有哪几种类型?
---The mid-exam is coming. I have some trouble with my lessons.
---Don’t worry. I think I can give you some suggestions ________.
A．value
B．valuable
C．of valuable
D．of value
