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2 results
160 views
8 months ago
산마루는 산정상을 나타내는 말인데, 등산로 주변에 배수를 위해 설치하는 겉도랑(명거, 明渠, 눈에 보이는 도랑)을 왜 산마루 측구(옆 ...
375 views
3 years ago
![[study with me] 5am-9am 4hours Professional Engineer Water Supply Sewage 상하수도기술사로 5급 2차 준비하기_250402](/api/proxy/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2FoT_8DcU5lyQ%2Fsddefault.jpg)
