国产午夜色色视频_日韩肉丝无码专区_在线日本高清免费不卡_国产又黄又爽又刺激在线网站_朝鲜女人大白屁股ass孕交_91免费观看视频_综合亚洲精品在线_亚洲午夜无码Av毛片不卡_欧美激情桃花国产精品拍自_亚洲午夜电影一区二区

Zhengding County Bairun Chemical Products Manufacturing Co., Ltd., located in ?Zhengding County, Shijiazhuang City ,Hebei Province . In 2009, the production of sulfide-based sulfur dyes. In recent years we continue to innovate, all using automated production technology, and in the raw material control and quality control system assiduously, sulphur black production technology more professional more mature, more stable product quality, performance is more superior. We produce sulphur black 200% sulphur black 220% ?240% with stable quality, excellent appearance and usability, won the national and Southeast Asian guests of all ages.