@@ Many efforts have been addressed in the last decade to the design and synthesis of macrocycle or macrocyclic complexes and to study of their physico - chemic
The synthetic principle and developmental future of polyferric flocculants are introduced in this paper. The questions of water environment can be solved effect
@@ Water - based paints have attracted more and more interest in almost every application area. Acrylic resin paint is highlighted and has been used widely, esp