“收集、评价、分析及发布事故相关的战术信息”是（ 　）的职责。

A．事故指挥官

B．行动部

C．策划部

D．资金/行政部

After putting on a self-contained breathing apparatus，you open the air supply and hear a continuous ringing of a bell. What does this mean?（）.

A.The unit is working properly

B.The face mask is not sealed properly

C.The air bottle needs to be refilled

D.The air supply hose has a leak