The retaining screw is a weak part of the whole superstructure . The causes of the screw loosening and fracture are complex and difficult to control.
固位螺钉是整个种植义齿上部结构中比较薄弱的部分，其松动、折断的成因复杂且难以控制。
In the third part, the design rules for the pressure hull, the retaining ring, the connect screw thread of the truth-preserving canister are analyzed.
第三章分析了耐压壳体、支撑环和保真筒连接螺纹等耐压部件的设计准则。
In the third part, the design rules for the pressure hull, the retaining ring, the connect screw thread of the truth-preserving canister are analyzed.
第三章分析了耐压壳体、支撑环和保真筒连接螺纹等耐压部件的设计准则。
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