The thesis stems from the subject of "Navigation Line Editor System of Navy based on ENC".
2
前言部分说明论文选题的原因、意义，论文写作的过程及材料来源，论文所采用的研究方法，以及致谢。
The preface includes the reasons and significance that I choice this thesis, the procedure of composing, the sources of data, the method of studying and acknowledgement.
3
引言部分主要介绍论文选题的来源、论文整体研究思路。
The forward part introduces the reason of selecting this topic and the mentality of researching.
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