pq两电荷的电场线分布如图所示cd为电场中的两点.一个离子从a运动到b轨迹如图中虚线所示.则下列判断正确的是 A.q带正电 b.c点电 Template




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tomskipq两电荷的电场线分布如图所示cd为电场中的两点.一个离子从a运动到b轨迹如图中虚线所示.则下列判断正确的是 a.q带正电 b.c点电 coloring