我们就在那块地面上竖起一个井架。
此方法也可供海洋井架电算参考。
And all those give as well a reference to offshore derrick design.
井架的起放作业不应在夜间进行。
司钻和井架工必须用对讲机一直保持联系。
The driller and the derrick man must remain in constant radio contact.
明白了吗?叫副司钻或井架工下来帮忙。 收藏。
Do you understand? Call the assistant driller (A. D. ) or derrickmen down to help us.
井架的风载能力?
井架的风载能力?
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