【单选题】A Long, long ago people made fires from lightening (闪电 ). But they had to keep the fire burning, for they couldn't start it again if there was no lightening. Later, they found out hitting two pieces o...

【简答题】变压器油的闪电指什么？

【简答题】他像一道闪电跑过操场。

【简答题】绝缘子的电气性能用干闪、湿闪、（）电压表示.

【单选题】雷电时是先看闪电,还是先听雷声?

【简答题】[名词解释] 污闪电压

【判断题】高级闪电效果不能自行设置动画

【单选题】绝缘子的击穿电压至少等于干闪电压的（）。

【单选题】闪电的平均电流是多少？

【简答题】闪电 哭了 吓 孩子