与丝绸�擦过的玻璃棒a分别靠�轻质小球b和c�现b被排斥c被吸引请判断bc的带电情况.b带正电c带负电或不带电. 题目和参考答案 Template




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tomski与丝绸�擦过的玻璃棒a分别靠�轻质小球b和c�现b被排斥c被吸引请判断bc的带电情况.b带正电c带负电或不带电. 题目和参考答案 coloring