Once the program is loaded, only a few parameters are given, the development drawings of variable pitch helical blade will be obtained.
该程序一经调用，只要给出几个相关的参数，即可绘出变螺距螺旋面展开图。
Once the program is loaded, only a few parameters are given, the development drawings of variable pitch helical blade will be obtained.
该程序一经调用，只要给出几个相关的参数，即可绘出变螺距螺旋面展开图。
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