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在/etc/group中有一行students：600：z3，l4，w5，有多少用户在students组里？（）
- A、3
- B、4
- C、5
- D、不知道
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单选题在/etc/group中有一行students：：600：z3，l4，w5，有多少用户在students组里？（）A
3B
4C
5D
不知道
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