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痢疾杆菌的生物学特点是(  )。

单选题
2021-07-17 21:50
A、革兰染色阳性
B、无鞭毛
C、各型痢疾杆菌均能产生外毒素
D、有荚膜
E、只有某些型的痢疾杆菌能产生内毒素
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正确答案
B

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