单项选择题
A.15mm B.18mm C.10mm D.12mm
A.1/100 B.1/160 C.1/200 D.1/150
A.1.8 B.1.7 C.1.6 D.1.5
A.75° B.30° C.45° D.60°
微信扫一扫,加关注免费搜题