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тоосны ангилал 20-22 Тоосны хүний эрүүл мэндэд үзүүлэх сөрөг нөлөө, өвчний шинж тэмдэг, эмчилгээ 23-28 Урьдчилан сэргийлэлт 29-30 2.2. Зарим химийн бодисын үед хэрэглэх амьсгал хамгаалах хэрэгсэл 30-32 2.3. Бичил уурхайн агаарын найрлага 32-34 Бичил уурхайн агаар дахь хүчилтөрөгч, метаны хэмжээг энгийн аргаар хянах заавар 34 …
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