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dinhhuuquanav26
2 năm trước
GIẢI THÍCH HIỆN TƯỢNG a) lấy 1 cục nc đá cho vào 1 cốc nc . Một lúc sau sờ mặt ngoài của cốc ta thấy ướt . Sau đó ko còn hiện tượng này . Tại sao ? b) những ngày hè nóng nực nên cắt rau vào những lúc nào thì tốt nhất . Tại sao? c) trong lúc nấu canh người ta thường cho lửa nhỏ khi sôi.Tại sao? d) khi nút trai bị kẹt trong lọ thủy tinh người ta thường làm thế nào để lấy cái nút ra dễ dàng . Tại sao?
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