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deechio
2 năm trước
thước nhựa sau khi có sát bằng mảnh vải khô sẽ có khả năng hút các vụn giấy nhỏ . Vậy nếu đưa mảnh vải khô lại gần các vụn giấy , mảnh vải sẽ hút hay đẩy chúng ?? vì sao ?
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