导曲线是指道岔中连接（）和辙叉部分的曲线轨道。
A、轨翼
B、转辙部分
C、护轮轨
D、基本轨
参考答案：B
28与14的积比215与78的差多多少？
What you need most is to_______ what you have learned to your work.
A．adjust
B．adapt
C．apply
D．attach
