A.0.5mm以內(nèi) B.0.5~1.0mm C.0~2.0mm D.1/3 E.1/2
A.0.1~0.2mm B.0.2~0.3mm C.0.3~0.4mm D.0.4~0.5mm E.0.5~0.6mm
A.2~3mm B.3~4mm C.4~5mm D.5~6mm E.6mm以上