第25题: [单项选择]铣削齿轮时产生的齿形误差属于( ) A. 加工原理误差 B. 机床几何误差 C. 夹具制造误差 D. 测量误差 参考答案:A 答案解析:[解析] 本题主要考查的知识点为加工原理误差的概念。 [要点透析] 加工原理误差是由于加工时采用了近似的刀刃轮廓或近似的成形运动而产生的误差。用模数铣刀铣削齿轮时,为减少刀具数量,常用一把模数铣
第26题: [单项选择]Questions 23 to 25 are based on the conversation you have just heard. A. He will meet her cousin sister at the station. B. He will ask for a leave from the class. C. He will have an interview. D. He will be on duty at the library. 参考答案:D 答案解析:[听力原文]23-25 M: Susan, could you do me a favor W: What is it, John You will ask for a leave f