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【单选题】
某软盘有40个磁道，磁头从一个磁道移至另一个磁道需要5ms。文件在磁盘上非连续存放，逻辑上相邻数据块的平均距离为10个磁道，每块的旋转延迟时间及传输时间分别为100ms和25ms，则读取一个100块的文件需要(11)时间。A.
17500ms
B.
15000ms
C.
5000ms
D.
25000ms
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