第二章抗战前刘鸿生企业集团的技术引进。
Chapter: the technological introduction of the Liu Hongsheng conglomerate before Anti-Japan War.
因此，作者进一步对刘韩生冲击波简化理论进行研究，在第三章探讨了解决各种渠道内冲击波问题的方法。
Therefore, the authors carried out further research on Liu Hansheng's shock wave theory, in the third chapter, the author discussed ways of solve shock wave problems of various channels.
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