A.0.1~0.25mm B.0.2~0.3mm C.0.125~0.25mm D.0.1~0.3mm
A.0.2mm B.0.125mm C.0.25mm D.0.3mm
A.上止點(diǎn) B.上止點(diǎn)后約15° C.下止點(diǎn) D.下止點(diǎn)后約15°