21.下列何種細菌常存在於人類口腔的微生物相(microbiota)中,也可引起牙周病?
(A)Aggregatibacter actinomycetemcomitans
(B)Helicobacter pylori
(C)Mycoplasma hominis
(D)Coxiella burnetii
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統計: A(1935), B(69), C(173), D(146), E(0) #2626656
統計: A(1935), B(69), C(173), D(146), E(0) #2626656