切削过程是指工件上一层多余的金属被刀具切除的过程和已加工表面的形成过程。
参考答案：对
The boy goes to school ______ every day. [ ]
A. by his bike
B. on his bike
C. by bike
D. B and C
以下地区不属于农产品出口生产基地的是（ ）
A．珠江三角洲
B．洞庭湖平原
C．闽南
D．山东半岛
