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비열 비중...CHANG SUNG 비중 재료명 비중값 재료명 비중값 재료명 비중값 물 1.0 경석 0.9 갈탄 0.75 강 7.85 응탄암 1.5 석탄 0.9 주철 7.25 사암 2.0
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