... underground dam 地下坝 underground installation 地下埋设物 underground moisture 地下水分 ...
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underground filling installation 地下装油设施
underground pipe installation 地下管道安装
underground vertical installation 地下立式安装
underground horizontal installation 地下卧式安装
Installation Construction of Underground Penstock 浅议地下埋管的安装施工
The installation of pig receiver &launcher is divided into above ground installation and underground installation.
收发球筒安装分地面安装及地下安装两种形式。
Practice for Underground Installation of Flexible Reinforced Thermosetting Resin Pipe and Reinforced Plastic Mortar Pipe (08.
柔性增强热固性树脂管和增强塑料砂浆管的地下安装惯例（08。
As silo is required and it is not convenient for receiver and launcher installation and pig disassembly, underground installation is not adopted now.
地下安装需设发射井，安装收发球筒及装卸清管器均不方便，现已不采用。
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