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【单选题】
系统响应时间是衡量计算机系统负载和工作能力的常用指标。用T表示系统对某用户任务的响应时间；Tuser表示为运行用户任务本身所占用的计算机运行时间；Tsys表示为完成该任务，系统占用的计算机运行时间。正确的公式为(54)。
A.
T=Tuser
B.
T=Tsys
C.
T=Tuser+Tsys
D.
T=Tuser-Tsys
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