According to the statistics of the General Administration of Customs,the export volume of Chinese rubber accelerators was 120,200tons,which decreased by 1.0%on
In order to enhance the efficiency of spectrum utilization and reduce communication overhead in spectrum sharing process, we propose a two-stage dynamic spectru
NaY zeolite was modified with oxalic acid, and Ce(Ⅳ)Y(1) zeolite was obtained via liquid phase ion exchange between the modified NaY zeolite and cerium nitrate