耐火集料：fireproof aggregate 耐火极限的计算：Calculated fire resistance rating ..
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The used lightweight aggregate is lightweight ceramsite, floating bead, vermiculite, expansion perlite or other lightweight fireproof raw material.
所用的轻质骨料为轻质陶粒、漂珠、蛭石、膨胀珍 珠岩或其它轻质耐火原料。
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