单项选择题
A.1/1000 B.1/100 C.1/10
A.0.25~0.45mm B.0.60~0.76mm C.0.76~1.10mm
A.0.60~0.76mm B.0.25~0.45mm C.0.125~0.25mm
微信扫一扫,加关注免费搜题