A.≥0.4B.≥0.5C.≤0.4D.≤0.5
A.352226X2-2RZ和SKF197726B.HRN-D和HRW-DC.SE-BT2-8503A-23D.353130X2-2RZ
A.352226X2-2RZB.SKF197726C.353130AD.353130B