30.馬原蟲性腦脊髓炎的病原為:
(A)Sarcocystis neurona
(B)Besnoitia bennetti
(C)Neospora caninum
(D)Isospora spp.
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統計: A(2171), B(356), C(288), D(179), E(0) #1587836
統計: A(2171), B(356), C(288), D(179), E(0) #1587836