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vinamlun2002
2 năm trước
Có 4 thanh A,B,C và D.Thanh A đẩy thanh B và hút thanh C,còn thanh C đẩy thanh D.Cho biết thanh D là thanh nhựa sẫm màu được nhiễm điện sau khi cọ xát với vải khô.Hỏi các thanh A,B,C,D mang điện tích gì?
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