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关注：1
2013-05-23 12:21
求翻译：When compared with visual aids,radionavigation systems typically have a greater coverage area and can be more cost effective if sufficient numbers of vessels carry the appropriate receivers.However,specific radionavigation systems include Decca,Omega,Rana and Toran是什么意思？ 待解决
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When compared with visual aids,radionavigation systems typically have a greater coverage area and can be more cost effective if sufficient numbers of vessels carry the appropriate receivers.However,specific radionavigation systems include Decca,Omega,Rana and Toran
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