如图所示电场中实线表示电场线一带正电粒子沿虚线轨迹由m�n运动若不计重力下列关于电场力做功和电势能变化正确的是 A.电场力做正功 Template




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tomski如图所示电场中实线表示电场线一带正电粒子沿虚线轨迹由m�n运动若不计重力下列关于电场力做功和电势能变化正确的是 a.电场力做正功 coloring