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如图所示,在y轴上关于O点对称的A、B两点有等量同种点电荷+Q,在x轴上C点有点电荷-Q,x轴上另一点D,且CO=OD,∠ADO=60°,下列判断正确的是( ) A.O点电场强度为零 B.D点电场强度为零 C.若在O点无初速度释放一不计重力的点电荷-q,则-q在OD间做加速度逐渐增大的加速运动 D.若在O点无初速度释放一不计重力的点电荷-q,则-q在OD间做加速度先增大后减小的加速运动
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