A. 正确 B. 错误
A. 5.5~6.5m,5.0~7.0m,4.5~7.5m B. 5.0~7.0m,4.5~7.5m,5.5~6.5m C. 5.0~7.0m,5.5~6.5m,4.5~7.5m D. 4.5~7.5m,5.5~6.5m,5.0~7.0m
A. 北方 B. 南方 C. 天津方向 D. 北京方向