제4장 가연성·폭발성 위험물의 화재 안전 지식 1
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1. 가연성 고체는 그 발화점의 높낮이, 연소 속도의 빠르기, 방출되는 기체의 독성 정도에 따라 ( )등급으로 나눌 수 있다. A 2 B 3 C 4 D 5 답변: A
온라인 조회 결과는 C, 4급입니다；어떻게 A를 선택하나요? 이유를 말씀해 주세요.
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