单项选择题
A.6m B.10m C.12m D.15m
A.1/10~1/3 B.1/10~1/5 C.1/8~1/3 D.1/8~1/5
A.0.6m B.0.8m C.1.0m D.1.2m
A.20mm B.30mm C.50mm D.80mm
微信扫一扫,加关注免费搜题