单项选择题
A.vc,f,ap B.f,ap,vc C.vc,ap,f D.ap,f,vc
A.磨料磨损 B.粘结磨损 C.扩散磨损 D.氧化磨损
A.ap,f,vc B.ap,vc,f C.vc,f,ap D.f,vc,ap