单项选择题
A.1.75 inches（4.45 cm）
B.2.5 inches（6.35 cm）
C.3.5 inches（8.89 cm）
D.4.25 inches（10.8 cm）
单项选择题 AtechnicianistroubleshootingalackofInternetconnectivityaffectingtheirentireoffice.The techniciansuspectstheissueiswiththeirInternetServiceProviderfailingtoprovideservice.WhichofthefollowingcommandlinetoolsshouldthetechnicianusetoBESTtestthistheory？（）
单项选择题 Asmallbusinesshashadunauthorizedpeopleentertheirserverroomanddamagetheirservers.WhichofthefollowinglocksforthedoorwouldBESTpreventunauthorizedpeoplefromaccessing theserverroom？（）
单项选择题 Atechnicianhasjustfinishedinstallinganewserverintoaserverrack.Whichofthefollowing shouldthetechniciandoNEXTtocompletetheinstallationdocumentation？（）