单项选择题
A.真北 B.象北 C.磁北 D.轴北
A.5m B.0.1mm C.5cm D.50cm
A.–2.45mm B.+2.45mm C.–1.45mm D.+1.45mm
A.-0.016 B.0.016 C.-0.032 D.1.987
微信扫一扫,加关注免费搜题