A disk scheduling mechanism in an operating system causes the disk arm to sweepback and f

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A disk scheduling mechanism in an operating system causes the disk arm to sweepback and forth across the disk surface servicing all requests in its path. This is a () :()A. First Come First Serve B. Shortest Seek Tn-ne FirstC. Scan D. None of the above

热搜:a是b的充分条件,b是a的必要条件吗