题目【单选题】补体激活经典途径中的C5转化酶是A. C3bBb3bB. C4b2a3bC. C3bBbD. C4b2aE. C56789【单选题】补体激活经典途径中的C5转化酶是A. C3bBb3bB. C4b2a3bC. C3bBbD. C4b2aE. C56789题目解答答案B. C4b2a3b