A.≤2mm B.3~4mm C.5~9mm D.11~19mm E.≥20mm
A.≥1:40 B.≥1:80 C.≥1:160 D.≥1:320 E.≥1:640
A.Fl B.F2 C.IgM D.IgG E.補(bǔ)體