The efficiency and quality of inside thread influence directly production rate and ratio of precision. Therefore, it is very important that choosing appropriate process way.
内螺纹加工效率的高低和加工质量的好坏直接影响零件的生产效率和精度，因此选择合适的内螺纹加工方法就显得尤为重要。
Retrieval performance includes evaluation of recall ratio, precision ratio, speed of retrieval, cost and convemence etc.
检索性能主要包括查全率、查准率、检索速度、费用与方便性等指标。
What would be an efficient way of calculating ratio of two factorials with arbitrary precision?
什么是两阶乘计算任意精度比的一种有效途径？
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