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[에듀강닷컴]가스용접_가스토치/가스용접기사용방법/보일러기능사/에너지관리기능사_welding

Written By 에듀강닷컴TV on Friday, May 17, 2013 | 12:02 AM

 
틀린부분 수정 : 불을끌때는 산소먼저 잠근 후 아세틸렌밸브를 잠궈주셔야 됩니다.(역화방지) 산업설비 전문 카페 에듀강닷컴[동영상강의] http://edukang.com http://edukang.tistory.com 교사 : 강진규

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