问题
单项选择题
牛的平均妊娠期为（）.
A.280天
B.150天
C.114天
D.30d
E.90d
答案
参考答案：A
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牛的平均妊娠期为（）.
A.280天
B.150天
C.114天
D.30d
E.90d
参考答案：A
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