8.成牛感染何種病毒時,會引起牛白血病(bovine leukosis)?
(A)leukemia virus
(B)coronavirus
(C)enterovirus
(D)calicivirus
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統計: A(3265), B(138), C(64), D(30), E(0) #1739199
統計: A(3265), B(138), C(64), D(30), E(0) #1739199