在详细的市场调研和分析基础上，文章首先论证了课题的研究意义和实现可能，体现在本文的第一部分。
The dissertation firstly demonstrates the research signification of project based on detailed market investigation and analysis, and the work is embodied in chapter one.
合同无效的原因主要体现在《合同法》第52条的五项规定中，文章对这五项规定作了具体详细的分析。
The reasons of causing a contract void are presented in the item 52 of contract Law. In the following parts, the author gives a detailed analysis to them.
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