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[单选题]
仔猪黄痢主要发生的年龄阶段是()
A.3日龄以内
B.2~3周龄
C.断奶前后
D.2月龄左右
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第3题
A、every lesson is always unique
B、every lesson is always same
C、every lesson is unique sometimes
D、every lesson is same sometimes
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