当前在OMP系统中位置为“/usr/home/xxx”，回到根目录的指令为（）。A、$lsB、$cD.C、$pwdD、$cd/
当前在OMP系统中位置为“/usr/home/xxx”，回到根目录的指令为（）。
- A、$ls
- B、$cD.
- C、$pwd
- D、$cd/
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