研究设计：应用前路钢板和双棒系统两种前路内固定治疗胸腰椎创伤后驼背的回顾性随访研究。
Study Design. A retrospective follow-up study of post-traumatic thoracic and lumbar kyphosis after anterior instrumentation with anterior plate and dual rod systems.
通过对打捆机的分析研究，研制了基于PLC的双CPU 模块的棒材全自动打捆机控制系统，描述了控制系统的软、硬件设计方法。
Through the deep theoretical research and analysis on bar binding machine, a PLC control system with double CPU is designed, and the way of designing software and hardware is described.
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