单项选择题
A.8.80% B.12.50% C.16.0% D.38.0% E.31.25%
A.碳C. B.氧(0) C.氮(N) D.氢(H) E.硫(S)
A.C1q、C4 B.C3b、C4b C.C3a、C5a D.C2a E.MAC
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