---____________?

---She is a waitress in a restaurant.

A．What is she doing.

B．What is she

C．What is she like

D．How is she

某220kV线路，无时限电流速断保护动作使C相断路器跳闸。试分析在雷雨大风和冬季覆冰各可能存在什么故障？并简述其故障范围。