30.綿羊發生腦灰質軟化症(Policoencephalomalacia),在營養上以下列何項缺乏較易發生?
(A)硫胺素(thiamine)
(B)核黃素(riboflavin)
(C)葉黃素(cryptoxanthin)
(D)氰鈷胺(cyanocobalamin)
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統計: A(1954), B(181), C(64), D(200), E(0) #1739141
統計: A(1954), B(181), C(64), D(200), E(0) #1739141