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(161), B(622), C(1211), D(284), E(0) #2743599
統計: A(161), B(622), C(1211), D(284), E(0) #2743599