41.狗的黑舌病是因缺乏下列何種vitamin所致?
(A)biotin
(B)choline
(C)thiamine
(D)niacin
答案:登入後查看
統計: A(112), B(42), C(194), D(887), E(0) #856181
統計: A(112), B(42), C(194), D(887), E(0) #856181