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高二学生，学到电场，想问一下为什么均匀实心球体对内部某一点有引力，而空心球壳对内任意一点引力为零？ 知乎 Template






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tomski高二学生，学到电场，想问一下为什么均匀实心球体对内部某一点有引力，而空心球壳对内任意一点引力为零？ 知乎 coloring
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