单项选择题
A.49.546m B.49.571 m C.49.531 m D.49.568m
A.+88.210 m,-207.911 m B.+207.911 m,-88.210 m C.-207.911 m,+88.210 m D.-88.210m,+207.911 m
A.1/2 000 B.1/500 C.1/1 000 D.1/5 000