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Кварцын элс: хэрэглээ ба үйлдвэрлэл Кварцын элс нь байгалийн гарал үүсэлтэй материал бөгөөд химийн шинж чанар, хагарал, хүч чадал, шингээлтийн боломж зэрэг шинж чанаруудаар тодорхойлогддог. Ихэнхдээ газрын тос, усыг шүүх, мөн барилгын материал, усан сан байгуулах зэрэгт ашигладаг. Одоо бүх зүйлийг дэлгэрэнгүй харуулав. Шүүгч …
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