题目经典途径的C3转化酶是A. C5、6、7、8、9nB. C3bBbC. C3bnBbD. C4b2aE. C4b2a3b经典途径的C3转化酶是A. C5、6、7、8、9nB. C3bBbC. C3bnBbD. C4b2aE. C4b2a3b题目解答答案D. C4b2a