单项选择题
A. Motherboard
B. Operating system
C. Expansion cards
D. Riser cards
单项选择题 AnadministratorhasjustfinishedphysicallyreplacingthesystemboardinaWindowsdomain controller.WhichofthefollowingmustbedonebeforebootingtheserverbackintoWindows？（）
单项选择题 Whichofthefollowingtechnologieswascreatedtoreducecost，increasecablelength，anduses3.3v acrosstheline？（）
单项选择题 WhichofthefollowingbackupmethodologiesisMOSTtimeefficientforbackingupdata？（）