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结果表明，气动V形牵伸机构在生产中适合大牵伸工艺，粗纱定量加重，成纱质量较弹簧摇架加压好。
The result shows that pneumatic V type draft mechanism is suitable for large draft technology in production, and if weighing roving quantum, yarn quality is better than pressure of spring cradle.
在纺纱预备阶段和纺纱设备使用大的牵伸。
Use of excessive draft in spinning preparatory and ring frames.
结论缓慢牵伸对周围神经造成的亚临床损害是可逆的，而且这种损伤可在牵伸后8周大部分恢复正常。
Conclusion the subclinical damage of peripheral nerve during limb lengthening are temporary reversible and can recover to normal after 8 weeks of lengthening.
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