单项选择题

共用题干题

假设一个磁盘有200个磁道，编号从0～199。当前磁头正在143道上服务，并且刚刚完成了125道的请求。如果寻道请求队列的顺序是86，147，91，177，94，150，102，175，130

为完成上述请求，采用最短寻道时间优先磁盘调度算法（SSTF）时磁头移动的总量是（）。

A.565
B.576
C.162
D.125

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Which of the following about Waelbers is TRUE？（）

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