单项选择题
A.Sealing all potential cold air leaks
B.Installing additional cooling fans
C.Setting the temperature lower
D.Replacing the UPS with a generator
单项选择题 AcorporationplanstoreplaceolderofficePCswithenergyefficientpersonalcomputersintheir24hourhelpdeskdepartment.WhichofthefollowingwouldbetheBESTchoice？（）
单项选择题 Whichofthefollowingtermsisusedwhenprintingdataonboththefrontandthebackofpaper？（）
单项选择题 Whichofthefollowingtechnologiescansaveserverspaceandcoolingrequirements？（）