【判断题】用圆柱铣刀加工平面,顺铣时,刀齿的切削厚度由厚到薄,而垂直切削分力向下,所以工件的表面质量好。但要求机床有间隙调整装置。
【判断题】用圆柱铣刀加工平面,顺铣时刀齿从上向下切削,刀齿的切削厚度从最大逐渐减小到零。
【单选题】Lesson 3: 1. The writer _________________________.
A.
doesn't like buying postcards
B.
doesn't like receiving postcards
C.
doesn't like writing postcards
D.
doesn't like postcards
【单选题】犯罪行为有连续或者继续状态的,追诉期限从()之日
【单选题】The father was not happy when the writer was going to Israel because_____.
D.
he wanted the writer to go to England
【判断题】用圆柱铣刀加工平面,顺铣时,刀齿的切削厚度由零到最大,而垂直切削分力 Fv 向下,所以工件的表面质量好。