单项选择题
A.dd
B.tar
C.cpio
D.restore
单项选择题 Asystemadministratorwantstoautomaticallyejectthebackuptapeeachnightafterthebackupiscomplete.Whichcommandcanbeusedtoejectthetape？（）
单项选择题 Therootvgdiskonasystemfailedandwasreplaced.Thesystemwasrestoredusingthelatestmksysb.However，nofilesinthe/homefilesystemwererestored.Whatisthelikelycauseofthisproblem？（）
单项选择题 Asystemwithoutamonitorhascrashed.Theadministratorwouldliketoseetheconsoleoutputtodetermineapossiblecauseofthecrashandensurethattherewerenoproblemsonreboot.Whichcommandwouldbeused？（）