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单项选择题 While a user is compiling a C program, "vmstat 120 10" is run to determine the cause of a performance problem.  Using the vmstat output as shown in the exhibit, which of the following conclusions is most appropriate to draw?（）

A、 There is a file I/O bottleneck.

B、 There are too many open files. 

C、 There appears to be a buffer shortage. 

D、 There is a paging space I/O bottleneck. 

  • A

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