机床的运动分为表面成形运动和辅助运动，其中表面成形运动又分为（）。
参考答案：主运动和进给运动
Can you think of some cases people are likely to tell lies?
A．that
B．as
C．where
D．when
—Jim is the fattest boy in his class. —Yes.No one is________him.
A．fat than
B．as fatter as
C．much fatter than
D．so fat
