应急预案经（）签署发布。
A.本单位主要负责人
B.本单位技术负责人
C.本单位的安全负责人
D.企业的法定代表人
参考答案：B
— Let's bet on Tom's performance in the coming examination; the loser has to treat the other
to a dinner.
— ______________. [ ]
A. I'm afraid so
B. You've got a point
C. It's a deal
D. You are welcome
指出下列电气图形符号为何设备和元件。
