车削圆锥体的方法有（）。
A.转动小刀架车削
B.用靠模板车削
C.用偏移尾座车削
D.用宽刃刀车削
参考答案：A, B, C
Helen has got _____ it takes to be a great tennis player. In other words, she has the potential to become world famous.
A．how
B．what
C．when
D．that
侧线
