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[单选题]
引起牛疯牛病（BSE)的病原是（)。
A.类病毒(viroid)
B.拟病毒(virusoids)
C.朊病毒(prion)
D.噬菌体(phage)
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.类病毒(viroid)
B.拟病毒(virusoids)
C.朊病毒(prion)
D.噬菌体(phage)
如果结果不匹配，请 联系老师 获取答案
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A瘤胃积食;
B前胃弛缓;
C肠阻塞;
D瓣胃阻塞;
E皱胃阻塞
A坚实;
B有液体震荡感;
C黏硬;
D紧张有弹性;
E空虚柔软
