具体研究内容如下：全文共分六章。
The main research contents are as follows: This thesis is divided into six chapters.
具体研究内容如下：第一部分为绪论。
The concrete research content is as follows:The first part is an introduction.
具体研究内容如下：第一部分：断裂韧度基本试验。
The specific research Content as follows:Part I:Basic fracture toughness tests research.
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