为下列零件正确选材。滚动轴承
A.1Cr18Ni9
B.GCr15
C . 40Cr
D.20CrMnTi
E. 60Si2MnA
F.F.ZGMn13-3
为下列零件正确选材。板弹簧
A.1Cr18Ni9
B.GCr15
C . 40Cr
D.D.20CrMnTi
E. 60Si2MnA
F.F.ZGMn13-3
为下列零件正确选材。汽车拖拉机变速齿轮
A.1Cr18Ni9
B.GCr15
C . 40Cr
D.D.20CrMnTi
E. 60Si2MnA
F.ZGMn13-3
为下列零件正确选材。机床主轴
A.1Cr18Ni9
B.GCr15
C . 40Cr
D.D.20CrMnTi
E. 60Si2MnA
F.F.ZGMn13-3