휘발유 수송 파이프라인의 용접부를 보수하는 방안
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누가 가솔린 파이프 용접부 수리 방안을 알고 있나요?감사합니다!
운전 상태에서 용접 결함을 보수한다는 말인가요?——압력 유지 하에 누수 방지
어떤 상태에서, 실행 중인가요 아니면 교체된 후인가요?
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