Hellow guys, Welcome to my website, and you are watching 가스핵심이론정리 필기 핵심이론2강 특정제조 긴급차단장치 가스누출경보기 방류둑 2중관 매설깊이 공지폭 수압, 분무 냉각살수. and this vIdeo is uploaded by 홍까스강의산업현장교수.홍까스 at 2022-08-07T19:47:43-07:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.