The principle and methods of various surface engineering technologies are introduced, and its study progress and application on manufactured and maintenance of vehicle engine is summarized.
介绍了各种表面工程技术的原理和方法，综述了有关表面工程技术在车用发动机制造和维修领域的研究和应用进展。
This study general introduce the basic character of biogas liquid residue and summarize its recently application as mixture of feedstuff, fertilizer, seed Soaking, pesticide and so on.
阐述了沼液的基本性质，并就其作为饲料掺拌剂、肥料、浸种剂、农药等的应用现状做了综述。
Based on the application and study situation, problems of synthesis process of acetylacetone and its development were studied.
针对乙酰丙酮的应用前景和研究现状，研究了目前乙酰丙酮合成工艺中存在的问题和发展趋势。
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