信号和报警装置是电气安全装置中的重要组成部分，有（）等。

A.超压报警装置，当容器压力达到危险值时，使控制中心报警

B.有电警告”报警装置，当人员接近极板带电体时发出声响信号进行报警

C.火灾报警装置

D.信号报警装置

A．The location of the session has been changed.

B．She will definitely go to the session this evening.

C．She’ll probably be too tired to walk to the session.

D．The session might be canceled because of a heavy snow.