A.C5a B.C4a C.C3a D.C3b E.C2a
A.清潔頭段尿 B.清潔中段尿 C.留24h尿 D.導(dǎo)尿
A.FrideriekGriffith B.AlfredHershey C.MarthaChase D.OswaldAvery