英文名称:1-Butene, 4-bromo-3,3,4,4-tetrafluoro-, polymer with 1,1-difluoroethene, tetrafluoroethene and trifluoro(trifluoromethoxy)ethene; 1-Butene, 4-bromo-3,3,4,4-tetrafluoro-, polymer with 1,1-difluoroethene, tetrafluoroethene and trifluoro (trifluoromethoxy) ethene; 4-Bromo-3,3,4,4-tetrafluoro-1-butene polymer with 1,1-difluoroethene, tetrafluoroethene and trifluoro(trifluoromethoxy)eth