本文界定高等级航道水上服务区的概念，并对服务区的功能进行详细分析；
The thesis explains the concept, classification of the serving area on water at first, analysing about the function of it at the same time;
本文界定高等级航道水上服务区的概念，并对服务区的功能进行详细分析；
The thesis explains the concept, classification of the serving area on water at first, analysing about the function of it at the same time;
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