轴箱体后盖孔尺寸为( )

轴箱体后盖孔尺寸为( )

A.φ230.5(0,0.115)

B.φ230.5(0,0.290)

C.φ230.5(0.115,0.290)

D.φ230.5(0,0.029)

正确答案是B