在线精品免费观看一区|九热精品视频|超碰91av|av一区二区三区在线播放,久久视频精品在线,国产一级理论片,国产精久久一区二区三区

Sulphur Black Sulphur parti-color Medicine intermediates Vat pink R Dye intermediates Others

Shanxi Linfen Dyeing Chemicals (Group) Co., Ltd. was founded in 1960 and became a limited liability company in 1997. At present, Shanxi Linfen Dyeing Chemicals (Group) Co., Ltd. is the executive director unit of China Dyestuff Association, one of top-500 chemical enterprises of China and one of top-20 dyeing chemical enterprises of China. We got the certificate of ISO9001 quality system in 1999. There are province-level enterprise technological center and 36 sets of leading...