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thuyduongtp21
2 năm trước
18.19. Điện tích dương là điện tích trên thanh : A.Thuỷ tinh cọ xát vào lụa . B. Nhựa sẫm màu cọ xát với khô. C. Nhựa cọ xát với lụa . D. Thuỷ tinh cọ xát với len .
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