单项选择题
A.10,5,2B.12,6,3C.10,5,3D.12,6,2
A.1.5-3,1.5B.1.5-3,2C.2-3,1.5D.2-3,2
A.8mm,30mB.8mm,50mC.10mm,30mD.10mm,50m