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