navigation aid
短语词组
- navigation -aid system 航标系统
- Navigation aid supervision 航标监管
- ground radio navigation aid 地面无线电导航设备
- navigation aid facility 助航设施
- radar triangle navigation aid 雷达三角导航设备
- navigation aid administration 航标管理
- ship radio navigation aid 船载无线电导航设备
- radio navigation aid 无线电导航辅助设备
- construction of navigation aid 航标建设 返回 navigation aid