22 引發馬傳染性貧血症(equine infectious anemia)的病原為下列何項?
(A)反轉錄病毒(retrovirus)
(B)附紅血球體(Eperythrozoon)
(C)錐蟲(Trypanosoma)
(D)艾利希體(Ehrlichia)
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統計: A(201), B(34), C(29), D(9), E(0) #1179408
統計: A(201), B(34), C(29), D(9), E(0) #1179408