题目

如图所示，在等量异种电荷连线的中垂线上取A、B、C、D四点，B、D两点关于O点对称，则关于各点场强的关系，下列说法中正确的是：     A．EA>EB，EB＝EDB．EA<EB，EA<EC C．EA<EB <EC，EB＝EDD．可能EA＝EC < EB，EB＝ED 答案：BC9．-Mike，the office is in a mess．It's your turn to clean it up．-________．I did it yesterday and the day before yesterday．（　　）A．Back in a moment．B．Don't count on me．C．Don't fall for it．D．Get off my back．