某静电场中的电场线如图所示带电粒子在电场中仅受电场力作用其运动轨迹如图中虚线所示由m运动到n以下说法正确的是 a.粒子必定带正电荷 Template




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tomski某静电场中的电场线如图所示带电粒子在电场中仅受电场力作用其运动轨迹如图中虚线所示由m运动到n以下说法正确的是 a.粒子必定带正电荷 coloring