对于不同规格的小螺距螺纹零件的数控加工，普遍采用重新编程的方法。
For the different specifications of the fine pitch thread machining of parts, the method commonly used by re-programming.
同时可以看出，螺距小的液轮机，其阻力系数比也较大。
The resistance coefficient of hydraulic turbine increases as screw-pitch increases.
采用小的螺距，和较大的螺距值来扫描可以提高CT图像质量并减少病人所接受的辐射剂量。
By adopting small pich and bigger pich value, the quality of CT images could be improved and the dose of radiation that patients take in would be reduced.
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