아크용접 6T 수평(2G) 용접기능사,산업기사 ARC WELDING
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13:51
도면? 알고가야 당황하지 않겠죠~용접기능장,용접기능사,용접산업기사,용접기사
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12:35
용접기능사 실기(필릿 가접,수직자세)SMAW(fillet)vertical position
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15:50
아크용접 9T 수직, ARC WELDING 9T 3G 용접기능사,용접산업기사,용접기능장
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12:08
아크용접 6T아래보기 용접기능사,산업기사
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13:58
스틸 플레이트 ARC 2G 용접 테스트
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10:45
아크용접 6T수직 용접기능사,산업기사 ARC WELDING 6T 3G
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3:09
자.붙.칠 피복아크용접기능사 실기 1강 (준비물) #용산철도고#자동차과
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14:44