使用跟刀架支承车削细长轴时，支承爪与工件接触松紧的调节是关键，若调节过紧，会把工件车成( )形。
A．腰鼓
B．锥
C．竹节
参考答案：C
— do you go to work?
— By bike.[ ]
A. How
B. What
C. Why
D. Which
---Miss Green, could you tell me how to improve my pronunciation?
---Sure. The most important thing is that you should _________.
A．do more exercise
B．use the dictionary correctly
C．listen and speak more
D．work out some outlines first
