丝绸和玻璃棒�擦后分开那么结果则是 A 丝绸和玻璃棒都带正电 b 丝绸带负电玻璃棒带等量正电c 丝绸不带电玻璃棒带正电 D Template




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tomski丝绸和玻璃棒�擦后分开那么结果则是 a 丝绸和玻璃棒都带正电 coloring