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在教学中教师应提醒学生注意刀具刃磨及车削过程中的关键技术问题，推荐“拓宽法”车削梯形螺纹的操作步骤。
In teaching, teachers should remind students to pay attention to the cutting tool grinding and turning the key technical issues, recommended “widening law” turning trapezoidal thread steps.