本论文首先研究了USB加密卡的相关设计技术。
Firstly, this thesis researches the correlative design technology of USB Cipher Card.
论文首先介绍了此次毕业设计的一些相关背景，并简单介绍申报征收机构岗位设想，论文中设计的数据库的用户就是这些岗位上的工作人员；
Firstly, the thesis introduced the background and the design of the application for the position for the levy structure, on which the occupiers will be the user of the Database we designed.
论文首先阐述了平原河网地区及其水文特性，以及该地区设计水位计算的研究现状。
At first, plain river network region and its hydrologic characteristics and the current situation of design water research are elaborated.
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