According to the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, scientists in China have used modern biotechnology for the first time in the world and successfully developed oligosaccharides, oligopeptides and biotechnology-related products such as chitooligosaccharides. Dalian ---MORE---
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The air filter is mainly used for air purification to remove dust particles. In addition, in some production processes, the exhaust gas contains fine pollutants ( such as radioactive materials, oil mist, etc. ). Although such purification is exhaust gas purification, an ai ---MORE---
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