錾切厚板料时，可先钻出密集的排孔，再放在铁砧上錾切。錾切直线时，应采用（）
A、狭錾
B、阔錾
C、油槽錾
参考答案：B
--Liu Xiang had to give up the race because of his foot.
--_________
A. What a shame! B. Of course. C. He was so careless.
论述在教学中教师要依次完成的九大教学事项。
