水平子系统一般情况下由（）组成。A、4对UTPB、25对UTPC、3对Multi Mo4e Fi2erD、1对Multi Mo4e Fi2er
水平子系统一般情况下由（）组成。
- A、4对UTP
- B、25对UTP
- C、3对Multi Mo4e Fi2er
- D、1对Multi Mo4e Fi2er
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