derrick installation的意思|示意

You can choose the rings, hook type, derrick installation.

可以选择吊环式，挂钩式，吊杆式安装方式。

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。

Results show that in view of safety and economy design of the derrick and it's lifting installation are reliable.

分析计算结果表明，钻塔结构安全可靠而且经济。因此，钴塔及其起升装置设计是合理的。