The borough is twinned with Kasel in Germany.该自治市与德国的卡瑟尔市结成了友好城市。Oxford is twinned with Bonn in Germany.牛津和德国的波恩结成了友好城市。Five Polish banks are to be twinned with counterparts in Western Europe...5 家波兰银行将和 5 家西欧银行结为姐妹银行。Fi...
所加的反应物可以是二烯烃 、 环二烯烃.The feed reactants can be alkadienes, cycloalkadienes.包含两个双键的化合物叫做二烯烃.Compounds containing two double bonds are called dienes.与二烯烃橡胶相比, EPDM的双键很少.Compared with diolefine rubber, EPDM has less double b...