题目【单选题】具有激肽样作用的补体裂解片段是A. C2a和C4aB. C3a和C4aC. C3b和C4bD. C3a和C4bE. C2a和C4b【单选题】具有激肽样作用的补体裂解片段是A. C2a和C4aB. C3a和C4aC. C3b和C4bD. C3a和C4bE. C2a和C4b题目解答答案B. C3a和C4a