The research background, significance, method and technological route were put forward in this part.
提出本文的研究背景、意义、方法、技术路线等。
Different enterprises' technological progress route causes different cost.
企业技术进步的途径不同，技术进步的发生成本不同。
Different enterprises' technological progress route causes different cost.
企业技术进步的途径不同，技术进步的发生成本不同。
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