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مقررات ملی ساختمان@Building_code P.21380
BUILDING_CODE Telegram 21380
آزمونک شماره(۶۳۸)

استفاده از مواد افزودنی حباب ساز هوا در کدامیک از شرایط زیر الزامی است(در بتن های معمولی)؟(عمران-نظارت )
Anonymous Quiz
بتن های تحت اثر حمله سولفات ها
بتن های مقاوم در برابر سایش
بتن تحت اثر یون کلر
بتن های تحت اثر چرخه یخ زدن و آب شدن
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