The preface part of the thesis introduces the research background, the contents of the thesis, the way of thinking, the research methods and the structure of the thesis.
第一章引言部分介绍论文的研究背景、研究内容及其意义、论文的研究思路和研究方法，以及论文的结构。
The research contents of this thesis include two parts: microwave biomedical imaging and evaluation of lightning electromagnetic effects.
本文包含微波生物医学成像和雷电电磁效应评估两方面的研究内容。
The research contents of this thesis areas follows: 1 the thesis analyses the rationales of GA composing and introduce its steps.
论文的研究内容如下：1论文分析了遗传算法作曲的基本原理并介绍了遗传算法作曲的步骤。
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