In order to clarify occurrence regularity of major damage generations of Nilaparvata lugens( Stl) in Sandu Shui Autonomous County( Sandu County for short),Gui
Rare-earth ternary catalysts Y(CCl_3COO)_3-ZnR_2-glycerin were prepared for the copolymerization of carbon dioxide and propylene oxide(PO),where dialkylzincs(Zn