风间由美在线观看-国产黄色精品-自拍偷拍综合-日韩色区-日本aaaa-日韩中文字幕免费-蜜臀久久久久久999-日韩tv-97精品一区二区-最新色网站-最新日韩精品-91蜜桃视频在线观看-免费看黄色三级三级-韩国一区在线-看免费的毛片-久久鲁视频-激情久久视频-精品国产一区二区三区久久久蜜臀-成人av一区二区在线观看-国产67194

Among the technical personnel specialized in research and development of our company, 7 have medium and senior titles, 4 have master's degree, 1 have doctor's degree, and 50 have college degree or above. The personnel are all professional technical personnel specialized in chemical industry. As well as the production director with more than ten years of experience in the production and management of white carbon, the front-line staff with rich experience in operation and long-term contact with tire customers sales staff.

By the end of May 2023, the company has 119 authorized patents, including 20 invention patents and 89 utility models.