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Насанд хүрэгчид, ахлах сургуулийн усны эргэлт Нарны илч усны эргэлтэд чухал шаардлагатай эрчим хүчийг хангаж өгдөг. Нар далай тэнгисийн усыг ууршуулдаг. Үл үзэгдэх усны уур агаар мандалд дэгдэж хүйтэн агаарт гарна. Усны уур конденсацид орж үүл болно. Галт уулаас савсах уурнаас үүл бий болно. Агаарын урсгал үүлсийг дэлхийн …
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