如图所示电场实线表示电场线.一个初速度为v的带电粒子仅在电场力的作用下从a点运动到b点虚线表示其运动的轨迹.则 A.粒子带正电b.粒子 Template




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tomski如图所示电场实线表示电场线.一个初速度为v的带电粒子仅在电场力的作用下从a点运动到b点虚线表示其运动的轨迹.则 a.粒子带正电b.粒子 coloring