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khibe2407
2 năm trước
1. Cọ xát một thước nhựa vào mảnh len, rồi đưa lại gần quả cầu bấc treo trên giá.Quả cầu bị thước nhựa đẩy.Có thể khẳng định quả cầu bị nhiễm điện âm được không? Giải thích?
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