摘要:19.如图Q1.Q2等量异种点电荷.MN为两点电荷连线的中垂线.A.B.C为电场中的三点.则有 A.EA>EB = EC.φA>φB = φC B.EA>EB>EC.φA<φB = φC C.EA>EB>EC.φA>φB>φC D.EA<EB = EC.φA>φB = φC

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