日日摸夜夜添夜夜添无码,99国产精品人妻噜啊噜,最刺激黄a大片免费观看下载,全免费a级毛片免费看无码

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.