Introducing American haas production line, the technique is in the domestic leading position in China is refrigeration equipment production and export important base.
引进美国哈斯生产线，技术处于国内领先地位，是我国制冷设备生产和出口的重要基地。
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The paper studies course scope, retrieval functions, retrieval technique, document export of the database retrieval systems, analyses the general and specific character, and points out the shortages.
Phenolic resin is the main export paint of China, so improving its technique, increasing its additional value and increasing its field of application can promote the benefit of our paint industry.