您要查找的是不是：
- 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。
- 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。
- 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。
- 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 convient 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。
- HDD) , the main method in Trenchless Technology, has become widely used for urban underground installation of new pipelines with its unique technical advantages. 随着非开挖技术的迅猛发展,水平定向钻进(HDD)技术以其独特的技术优势,在目前城市地下管线铺设工程中起着越来越重要的作用。
- Neither of the underground installations was greatly affected by the blast. 上述两处地下装置均未受到爆震的严重影响。
- Practice for Underground Installation of Thermoplastic Pressure Piping 热塑压力管地下安装惯例
- Recently they have laid an underground pipeline. 最近他们铺设了一条地下管道。
- The missile is delivered from underground. 这种导弹由地下发射。
- They were suspected of underground activities. 他们被怀疑进行地下活动。
- Moles stay underground most of the time. 钱鼠大部分时间住在地下。
- He went underground to avoid capture. 他转入秘密工作以免被捕。
- The cavers discovered a vast underground chamber. 探穴人发现了一个地下大洞穴。
- The quickest way to go round the city is by underground train. 在这个城市四处走动最快的办法就是乘坐地铁。
- Radar technology; a radar installation. 雷达技术; 一个雷达站
- The mole bored (its way) underground. 鼹鼠在地下挖掘(路)。
- The prisoner escaped by digging an underground tunnel. 囚犯挖了一条地道逃跑了。
- Installation of these machines will speed up production fifty per cent. 装备这些机器可以使生产速度加快百分之五十。
- Some miners were trapped underground after the collapse. 塌方后，有些矿工被困在地下。
