... 活动基墩removable foundation 井架安装derrick installation 扒杆gin pole ...
双语例句
1
You can choose the rings, hook type, derrickinstallation.
可以选择吊环式，挂钩式，吊杆式安装方式。
2
G. beautiful appearance, simple and convenient for installation, derrick, ceiling, wall and so on many kinds of installation, suitable for different lighting needs at the scene.
外形美观，安装操作简单方便，吊杆式、吸顶式、壁挂式等多种安装方式，适合不同工作现场的照明需要。
3
Results show that in view of safety and economy design of the derrick and it's lifting installation are reliable.