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【多选题】
有关正常菌群的叙述，正确的是A.
正常菌群对人体没有任何意义
B.
正常菌群对保持人体生态平衡和内环境的稳定有重要作用
C.
正常菌群受到破坏会导致菌群失调
D.
菌群失调不会导致严重后果
E.
正常菌群在正常情况下是无害的
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