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Дэлхийн царцдасын 25.7% - ыг ( массын) цахиур бүрдүүлнэ. Цахиурыг шил, цемент, эмнэлэгт хэрэглэхээс гадна, хамгийн гол нь хагас дамжуулагчийн үйлдвэрлэлд өргөн хэрэглэнэ. Цахиур нь ургамалын, ялангуяа өвслөг ургамлын метаболизмын үйл ажиллагаанд маш чухал үүрэг гүйцэтгэнэ. Изотопи Нунтагласан цахиур
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