91香蕉视频下载网站_91在线大香蕉_香蕉视频国产_91香蕉视频免费看 ,久久国产免费福利永久,狠狠热精品视频,亚洲欧美91AV,超级香蕉97视频在线观看

Ningbo Jiasi Chemical Co., Ltd.

A high-tech chemical enterprise integrating R & D, production and sales
Our main products include: pharmaceutical and pesticide intermediates, non-ionic surfactants with defoaming and wetting effects, liquid crystal and electronic chemicals, photosensitive and photochromic materials chemicals, photoinitiators, etc.
Specializing in unit chemical reactions such as Grignard, Sandmeyer, Friedel-Crafts reaction, bromination, low temperature nitration, reduction, heterogeneous catalytic oxidation, phenol hydroxyl etherification and cyclic condensation, etc.