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환경 보호 매일 한 문제 (12.28)

2016-12-28View Original

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단일 선택문: 일반적으로 사용되는 소포제는 성분에 따라 실리콘(수지)류, 계면활성제류, 알칸류, 그리고 로 나눌 수 있다.A. 산알칼리류 B. 광물유류 C. 점토류 D. 산화제류 선택: B

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