The use of magnets as aids to navigation can be traced back at least to the eleventh century . 磁铁用于航海,至少可追溯到11世纪。
The main dimensions of aids to navigation on inland waterways 内河助航标志的主要外形尺寸
Trailered inter - coast waterway aids to navigation boats 入海河口引航船
Pharos is an important aid to navigation for ships 航标灯是江河与海洋上船只重要的助航标志。
The regulation for surface colours of the visual aids to navigation in china 中国海区视觉航标表面色规定
Aids to navigation on inland waterways 内河助航标志
Superintendent of aids to navigation 辅航设备监督
It also maintains aids to navigation and mooring buoys for ocean - going ships , manages two cross - boundary ferry terminals and administers eight public cargo - working areas . the department s web site 该处又维持辅航设备和远洋船舶系泊浮泡,并管理两个跨界客运码头和八个公众货物装卸区。
According to the consistent conclusion of the three applied methods , the paper demonstrates the feasibilities for the three quantitative methods of technical risk evaluation of aids to navigation 通过三种方法排序的一致性,可以明确得出指标体系中各风险评估指标对航标技术风险的影响程度。
According to the require of the international management of aids to navigation , the quality assessment system of regional msa is established basing on the analyse of quality assessment of china coastal aids to navigation , which applies to the assessment of regional msa 海区的航标质量考核指标体系,是依据国际航标管理的要求,经过对中国沿海航标质量考核的分析和评价的基础上所建立起来的,该考核适用于对海区的考核。