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 国家开放大学 / 动物常见病防治

3、本病发生原因的是(  )


a.
采食多量易发酵饲料

b.
长期饲喂单一饲料

c.
偷食红薯、桃等块状食物

d.
含有金属异物的饲料

e.
长期饲喂粉状饲料
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