I often go to school ________. [ ]
A. by bus
B. by a bus
C. by the bus
答案：A
钳工的基本技术工作有（）、錾削、锯切、锤削、钻孔、铰孔、攻丝、套扣、刮削、研磨、装配和修理。
A、划线
B、配制
C、准备
D、工作台
.厄尔尼诺的危害
