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2 năm trước
thanh nhựa,thanh thủy tinh đều cấu tạo bởi nguyên tử, trong đó có điện tích âm, điện tích dương.Tại sao trước khi cọ xát chúng không hút các vụn giấy nhỏ???? Giúp mình với ạ
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