69.魚類體表出現淺層性白點,應是下列何種病原所造成?
(A)Argulus sp.
(B)Myxidium sp.
(C)Amyloodinium ocellatum
(D)Aphanomyces invadans
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統計: A(142), B(550), C(1031), D(251), E(0) #2743599
統計: A(142), B(550), C(1031), D(251), E(0) #2743599