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。

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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。

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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。

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