산업안전지도사 2차논술 및 면접(건설) - 터널NATM공법, 지보재의 종류, 락볼트, 숏크리트, 지보공 조립 점검사항, 라이닝의 역할
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Channel: 한국기술사학원
Views: 1,908
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Id: HKlvK9aMwj8
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Length: 17min 19sec (1039 seconds)
Published: Thu Jun 15 2023
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