单项选择题
Which of the following terms is used when printing data on both the front and the back of paper？（）
A.Scaling B.Copying C.Duplex D.Simplex
单项选择题 Whichofthefollowingtechnologiescansaveserverspaceandcoolingrequirements？（）
多项选择题 Whichofthefollowingmethodseffectivelyremovesdatafromaharddrivepriortodisposal？（）
单项选择题 ThepowersavingstateinwhichacomputercutspowertoallitsunneededpartsandcopiestheRAMcontenttotheharddriveiscalled（）
