A.1/2處 B.1/4處 C.1/3處 D.3/4處
A.最大 B.最小 C.12mm D.16mm
A.側(cè)面磨耗 B.1/2側(cè)面磨耗 C.1/3側(cè)面磨耗 D.1/4側(cè)面磨耗