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thuphuong0590
2 năm trước
Câu 22. Dung dịch nước muối sinh lí NaCl 0,9% dùng xúc miệng khi bị ho, viêm họng, viêm lợi nhờ tác dụng diệt khuẩn. Để pha 500 gam dung dịch NaCl 0,9% cần lấy bao nhiêu gam NaCl và bao nhiêu gam nước? Câu 23. Bột nở là chất gì mà có thể làm cho bánh to ra và xốp được?
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