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● 若一个单处理器的计算机系统中同时存在3个并发进程,则同一时刻允许占用处理

器的进程数 (13) 。     

(13)

  • A.至少为1个    
  • B.至少为3个 
  • C.最多为1个     
  • D.最多为3个
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