当电场强度超过时,阴雨天的空气会被击穿而放电。现有一片距空旷地面300m高的带电 发布时间:2017-04-18 15:30 │ 来源:www.tikuol.com 题型:选择题 问题: 当电场强度超过时,阴雨天的空气会被击穿而放电。现有一片距空旷地面300m高的带电乌云,乌云与地面间要发生闪电,两者间的电势差至少为( )A.B.C.D.
题型:选择题 They were ________ busy ________ with each other ________ the time.A.too; talking; to forgetB.so; talking; that they forgotC.so; to talk; that they forgotD.too; to talk; to forget 查看答案