【名词&注释】
医护人员(medical staff)、绝经期妇女(postmenopausal women)、染色质(chromatin)、上皮细胞(epithelial cells)、EDTA络合滴定法(edta complexometry)、Ⅰ型超敏反应(hypersensitivity ⅰ)、必不可少(absolutely necessary)、补体成分(components of complement)、测定法(assay method)、Ⅳ型超敏反应(type iv hypersenetivity)
[多选题]激活补体活化的经典途径中必不可少(absolutely necessary)的补体成分(components of complement)是 ( )
A. C1
B. C2
C. C3
D. C4
E. C6