SS120单柱施工升降机由金属结构、工作机构、电气控制以及安全保护装置等部分组成。
The SS120 column construction lift is composed by metal structure, working mechanism, electrical control and safety protection instrument.
目的：探讨髋臼后柱的解剖学结构和螺钉放置的安全角度和范围。
Objective: to investigate the anatomical structures of the posterior column of the acetabulum and to develop a safe path for screw placement into it.
目的：探讨髋臼在其前、后柱上的投影和螺钉放置的安全范围。
Objective: to investigate the X-ray projection of acetabulum on its anterior and posterior column and to develop a safe area for screw placement.
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