介绍了桩的分类，试桩的重要性。
This paper describes the classification of the pile, the importance of test pile.
简要阐述了先进制造技术的重要性、分类组成及发展趋势。
Development of Modern CAD Technology under Advanced Manufacturing Technology Environment;
简要阐述了先进制造技术的重要性、分类组成及发展趋势。
Development of Modern CAD Technology under Advanced Manufacturing Technology Environment;
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