annular drainage 中文意思是什麼
annular drainage
解釋
環形排水系統-
Standard specification for 12 to 60 in. 300 to 1500 mm annular corrugated profile - wall polyethylene pipe and fittings for gravity - flow storm sewer and subsurface drainage applications
自流式雨水管和地下排水裝置用12至60英寸300 to 1500 mm環形波紋狀異型壁聚乙烯管和配件的標準規范 -
Annular drainage pattern
環狀水系型 -
Study on coal seam roof gas drainage from the strike of annular fracture areas by the long drill method
開採煤層頂板環形裂隙圈內走向長鉆孔法抽放瓦斯研究
分享友人