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【12-1】직업건강 버전 매일 한 문제

2016-12-01View Original

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이 게시글은 마지막으로 아천이 2016-12-3 09:19에 수정했습니다. 【12-1】직업건강 코너의 매일 한 문제: 판단문제 – 두꺼운 석탄층을 채굴할 때 발생하는 먼지 양이 얇은 석탄층을 채굴할 때보다 많습니다.맞아요

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