안전기술 교류판 매일 한 문제 (2016.5.19)
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이 게시물은 마지막으로 68589544에 의해 2016-5-22 10:13에 수정되었습니다.bg8.png 유형: 공백 채우기 문제
문제: 【화재 안전 기술】연소가 일어나기 위해서는 반드시 갖추어져야 하는 세 가지 조건은 ________, ________, ________입니다.
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