单项选择题
A.Re-install the operating system.
B.Open and close the cover.
C.Use the function key to activate the monitor.
D.Install new software for the keyboard.
单项选择题 Afterbootingupanewcomputer，atechnicianobservesthattheUSBportsarenotworkingwithanyUSBdevices.WhichofthefollowingshouldbedoneFIRST？（）
单项选择题 Aclientreportsthatthelaptopisnotperformingacompletechargeofthebattery.WhichofthefollowingactionsshouldbetakenFIRST？（）
多项选择题 WhichofthefollowingareprimarydifferencesbetweenalaptopandadesktopCPU？（）