单项选择题
A.3° B.5° C.7°
A.≤32mm B.≤52mm C.≤72mm
A.≥22mm B.≥38mm C.≥58mm
A.0.4m~0.6m B.0.8m~1.2m C.1.4m~1.8m
微信扫一扫,加关注免费搜题