汽车后桥总成中没有一个差速器，它的作用是使左右两轮有可能以（），尽可能使车轮接近纯滚动。差速器属行星轮机构。
参考答案：不同转速旋转
The doctor came up and asked me _____the day before.
A．what I had eaten
B．what had I eaten
C．that what I had eaten
D．that what had I eaten
患儿，男，7个月，患有右小耳畸形，左耳完全正常。下列哪种处理最为适宜( )
A．立即行耳再造B．1岁置入骨传导听力辅助装置C．4岁时植入硅橡胶耳支架D．4岁时行外耳道成形E．6岁时可行自体肋软骨耳再造术
