单项选择题
A.Shutdown/power policies
B.Redundant power supplies
C.Use optical mice
D.Social engineering policy
单项选择题 Whichofthefollowingneedstoberecycledduetodangerousamountsofgascontainedinsideitshousing？（）
单项选择题 Whichofthefollowingwillallowmultipleoperatingsystemstorunononeworkstation？（）
单项选择题 Auserreportsthattheircellphonebatteryisdeadandcannotholdacharge.Whichofthefollowingshouldbedonewhendisposingoftheoldbattery？（）