一带电粒子仅在电场力的作用下从电场中的a点运动到b点运动轨迹如图中虚线所示则正确的是 A.粒子带正电 b 粒子在a处的电势能大于在 Template




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tomski一带电粒子仅在电场力的作用下从电场中的a点运动到b点运动轨迹如图中虚线所示则正确的是 a.粒子带正电 b coloring