为什么丝绸�擦过玻璃棒是正电,而用毛皮擦过的橡胶棒是负电? 知乎 Template




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tomski为什么丝绸�擦过玻璃棒是正电,而用毛皮擦过的橡胶棒是负电? 知乎 coloring