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daudaihoc2019
2 năm trước
Vì sao đun nóng ngọn lửa đèn cồn ở ngoài không khí lại cháy chậm và mờ ? Muốn cho lửa cồn đó cháy mãnh liệt hơn thì phải làm sao ? Vì sao chọn cách này ?
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