operational control authority
... 航运港埠公约 maritime ports convention 航运管制；作战管制机构 operational control authority {= OCA} 航运索引日报 Daily Index ...
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短语
国际航运管制
regulation of international shipping
船航运管制
shipping control
航运管制官
shipping control authority
管制航运
controlled shipping
航空运输管制
air traffic control