井架采用三节伸缩式结构，底座采用平行四边形结构，能用液缸整体起升。
The structure of the derrick is triple-section telescoping structure, substructure is parallelogram structure, can be lifted by hydraulic cylinder.
井架采用三节伸缩式结构，底座采用平行四边形结构，能用液缸整体起升。
The structure of the derrick is triple-section telescoping structure, substructure is parallelogram structure, can be lifted by hydraulic cylinder.
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