<p>용접(가스용접하기) - 가스용접_가스토치/가스용접기사용방법/보일러기능사/에너지관리기능사<br></p><p><br></p><p><a href="https://www.youtube.com/watch?v=VQaOdWInvcQ" target="_blank">https://www.youtube.com/watch?v=VQaOdWInvcQ</a><br></p>