两个相同的验电器a和ba带正电b不带电用一根带绝缘柄的铜棒把两个验电器的�属球连接起来的瞬间 A.有质子从a�b移动b.有电子从a� Template




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tomski两个相同的验电器a和ba带正电b不带电用一根带绝缘柄的铜棒把两个验电器的�属球连接起来的瞬间 a.有质子从a�b移动b.有电子从a� coloring