operating system 高清第九版英文

Anoperatingsystemisaprogramthatmanagesacomputer’shardware.It alsoprovidesabasisforapplicationprogramsandactsasanintermediary betweenthecomputeruserandthecomputerhardware.Anamazingaspectof operatingsystemsishowtheyvaryinaccomplishingthesetasks.Mainframe oper