Yog'ochni hosil bo’lishi uchun zarur bo'lgan karbonat angidrid miqdorini aniqlash

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Amal qilish muddati o‘tgan dori, kimyoviy moddalarni nima qilasiz?
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
kimyoviy moddalardan foydalanish konun qoidalarini bilasizmi? Qanday turdagilari 
havfliroq?
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