本文简要介绍了国内外对煤的化学结构，及其在溶剂精炼工艺中的特性研究的主要成果和结论。
This paper reviews the main achievements and conclusions in research of coal chemical structure and characteristics in solvent refining processes in the world.
第五章研究结论与反思，总结了本研究的主要成果和结论，并对存在的不足进行了分析与展望。
Chapter five is research conclusion and consideration. It concludes major achievements and conclusions of the research, analysis drawbacks and the future.
结合最新研究成果，从裂纹尖端应力场和裂纹扩展两个方面，阐述了功能梯度材料弹性断裂分析的研究方法和主要结论。
Based on the latest research fruits, methods and main conclusions of FGMS fracture analysis are reviewed from the aspects of asymptotic fields near the crack-tip and crack expansibility.
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