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单项选择题A system administrator has a server that is performing poorly. The vmstat command identifies that high CPU usage is the problem. Which of the following commands can be used to identify the eight most active processes running on the server？（）

A、ps -ef -t8

B、sar -u -p 8

C、vmstat -t 8

D、topas -p8 -n0 -d0

  • D

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