It is very difficult for the beginners to master the common methods of processing echelon screw thread because of the high difficulty in the process and the high request to the operators.
常见的梯形螺纹车削，由于车削加工难度较大，操作技能要求较高，因而使初学者学习起来较困难。
It is very difficult for the beginners to master the common methods of processing echelon screw thread because of the high difficulty in the process and the high request to the operators.
常见的梯形螺纹车削，由于车削加工难度较大，操作技能要求较高，因而使初学者学习起来较困难。
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