如图所示的电场中虚线为某带电粒子只在电场力作用下的运动轨迹abc是轨迹上的三个点则a.粒子一定带正电 B.粒子一定是从a点运动到b点 Template




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tomski如图所示的电场中虚线为某带电粒子只在电场力作用下的运动轨迹abc是轨迹上的三个点则a.粒子一定带正电 b.粒子一定是从a点运动到b点 coloring