heptavalent element 七价元素
ADJ having a valency of seven 七价的 (See also septivalent) [chem]
A heptavalent vaccine protecting against meningitis A and C was licensed in 2007.
预防甲型和丙型脑膜炎的七价疫苗于2007年获得许可。
A tetravalent meningococcal meningitis vaccine (licensed in the United States) and a heptavalent vaccine protecting against meningitis A and C (to be licensed in 2007);
一种四价流行性脑脊髓膜炎疫苗（已在美利坚合众国获许可证）和一种预防脑膜炎A和C的七价疫苗（将于2007年注册）；
应用推荐