将同步器锁环套在第一轴3档齿轮的齿端锥面上时,两个端面之间完全接触而无间隙,说明两锥面磨损()。
A.严重
B.中等
C.正常
D.根本没有
参考答案:A
I ________my homework to make sure that nothing had been missed.
A.went through
B.got through
C.broke through
D.looked through
蒙古花纹有()贺纹。