2. 计算机
  3. The　kernel　is　the(66)of　an　operating　system　such　as　Windows98,　Windows　NT,　Mac　OS　or　Unix.　The　kernel　provides　basic　services　fo

The　kernel　is　the(66)of　an　operating　system　such　as　Windows98,　Windows　NT,　Mac　OS　or　Unix.　The　kernel　provides　basic　services　fo

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问题 The　kernel　is　the(66)of　an　operating　system　such　as　Windows98,　Windows　NT,　Mac　OS　or　Unix.　The　kernel　provides　basic　services　for　the　other　parts　of　the　operating　system,(67)it　possible　for　it　to　run　several　programs　at　once(multitasking),　read　and　write　files　and　connect　to　networks　and　peripherals.　Applications　and　utility　programs　use　the　services　provided　by　the　kernel　to　provide　practical　business　functionality.
　　　In　operating　systems　such　as　Windows　or　most　versions　of　Unix,　the　kernel(68)everything　except　application　and　utility　programs.
　　　In　microkernel　operating　systems　such　as　Digital　Unix　and　Apples　forthcoming　Mac　OS　Server,　the　kernel(69)supports　only　multitasking　and　memory　management.　Other　services　such　as　applications,　utilities　and　the　user　interface　support　device　drivers,　API　and　graphics　which　all(70)outside　the　microkernel.
选项 A、it
B、itself
C、that
D、which
答案B
解析
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