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Америкийн Нэгдсэн Улс — Википедиа нэвтэрхий тольАмерик улс буюу бүтнээр хэлвэл Америкийн Нэгдсэн Улс (товчоор АНУ; англ. United States of America) Умард Америк тивд оршдог. Хойд талаараа Канад, урд талаараа Мексик улстай хиллэх бөгөөд зүүн зүгт Атлантын далай, баруун зүгт Номхон далай, урд зүгт Мексикийн булан хүрдэг. 50 муж улс болон Колумбын тойргоос бүрдсэн холбооны, бүгд найрамдах улс юм. Аляска, Хавай, Пуэрто-Рико зэрэг тусдаа орших нутагтай. 9.6 сая км² газарт (дэлхийд …
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Бетоны дүүргэгч материалын хэрэглээ, чанар хангалт
Тухайлбал одоо мөрдөж байгаа Олон улсын ISO 19595:2017 "Natural aggregates for concrete", АНУ-ын ASTM С 33-03 "Standard Specification for Concrete Aggregates", Европын холбооны EN 12620:2010 "Aggregates for concrete", ОХУ-ын ГОСТ 8267-93 "Щебень и гравий ...
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