避雷器有哪几种类型？
参考答案：
避雷器主要有管型避雷器、（1分）阀型避雷器、（2分）氧化锌避雷器等几种。（2分）
She wanted to know ________ [ ]
A. why didn't I think it was a good idea
B. why I didn't think it was a good idea
C. why I thought it wasn't a good idea
D. why did I think it wasn't a good idea
带电装表接电工作时，应采取防止（）的安全措施。
A.短路和电弧灼伤
B.断路和接地
C.跌伤或碰伤
D.特殊天气
