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在计算机A上，通过NFS把计算机B上的/usr/lib挂接到A的/usr/lib需要执行（）。
- A、connect B：/usr/lib/usr/lib
- B、ln B：/usr/lib/usr/lib
- C、mount B：/usr/lib/usr/lib
- D、mount A：/usr/lib B：/usr/lib
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