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【单选题】
无芽胞厌氧菌的特点是（）A.
形态特点有鉴别意义
B.
主要引起外源性感染
C.
在肠道内数量是需氧菌的1000倍
D.
菌体内形成异染颗粒
E.
以上都不是
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A.
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B.
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C.
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D.
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A.
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