目的观察体外冲击波对兔长骨牵伸骨痂形成的早期作用，探讨其作用机制。
Objective To investigate the early effect of extracorporeal shockwave (ESW) treatment on distraction osteogenesis of rabbit tibias and its mechanism.
分析了胶辊、胶圈在纺纱牵伸过程中的主要作用原理，以及胶辊、胶圈主要技术性能与纺纱工艺之间的关系。
Analysis is done to the main working principle of cots plus aprons in drafting process as well as the main specifications of cots plus aprons on spinning process.
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