Master business management and marketing sales knowledge, know about trend of market need, status and development trend of bus and coach technology.
经营管理知识，市场营销知识，了解市场需求趋势，产品技术现状和发展趋势。
Research and application status of MEMS are introduced, the development trend is analyzed from the Angle of market and technology respectively.
主要介绍了MEMS的研究和应用现状，分别从市场和技术的角度分析了MEMS的发展趋势。
The article analyzes the status of polylactic acid productive technology, market and application and puts forward future development prospect of polylactic acid.
前言：分析了聚乳酸生产技术、市场和应用的现状，提出了聚乳酸未来发展前景。
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