操作系统概念第七版课后习题答案(英文版)1.1Inamultiprogrammingandtime-sharingenvironment,severaluserssharethesystemsimultaneously.Thissituationcanresultinvarioussecurityproblems.a.Whataretwosuchproblems?b.Canweensurethesamedegreeofsecurityinatime-sharedmachineasinadedicatedmachine?Explainyouranswer.