Which is the most commonly used bearing? （ ）
A.Deep groove ball bearing
B.Taper roller bearing
C.CARB toroidal roller bearing
D.All Right
正确答案是A
Which is the most commonly used bearing? （ ）
A.Deep groove ball bearing
B.Taper roller bearing
C.CARB toroidal roller bearing
D.All Right
正确答案是A