Conclusions: MPCNL is a therapeutic modality with advantages of high achievement ratio and slight injury especially for upper ureteric calculus with narrow ureter and ureter twist.
结论：MPCNL治疗输尿管上段结石，取石成功率高，创伤小，尤其在输尿管上段结石并发狭窄、扭曲时有良好的疗效。
With twist-against-twist composite yarn, the correlation between breaking strength, breaking elongation ratio and twist of single yarn, twist of composite yarn are analyzed.
在复合纱线反向加捻的情况下，通过试验分析了复合纱线断裂强力、断裂伸长率与单纱捻度、复合纱线捻度之间的关系。
In the spinning process equalization point of the yarn is influenced by twist, spinning tension, roving interval, and overfeed ratio. Certain relationship exists among them.
纺纱过程的平衡点受成纱捻度、纺纱张力、须条隔距及超喂率的影响，它们之间存在一定的关系。
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