有一带电粒子沿图所示的虚线轨迹穿过一匀强电场不计粒子的重力则粒子从a到b点的过程中 A.电势能一直减小 b.动能先减小后增大 C.电 Template




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tomski有一带电粒子沿图所示的虚线轨迹穿过一匀强电场不计粒子的重力则粒子从a到b点的过程中 a.电势能一直减小 b.动能先减小后增大 coloring