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The main content is as follows:1. The establishment of the state equations .
本文研究的主要内容有：1、状态方程组的建立。
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The article consists of four parts, its main content as follows.
全文主要分为四个部分，其主要内容如下。
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The article consists of four parts, its main content as follows.
全文主要分为四个部分，其主要内容如下。
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