如图所示一个质子沿abc的轨迹运动则 A.电势先降低再升高b.质子的电势能先降低再升高c.电场力始终做正功d.电场力先做负功再做正功 Template




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tomski如图所示一个质子沿abc的轨迹运动则 a.电势先降低再升高b.质子的电势能先降低再升高c.电场力始终做正功d.电场力先做负功再做正功 coloring