【简答题】If you've been to Europe a few times already,chances are that you've hit all the big destinations: London, Paris, Rome,Berlin.On your next trip you can either visit those same cities a second time,or ...
【单选题】Desktop computers have a(n) _____ unit, located within the system unit, that plugs into a standard wall outlet, converts AC to DC, and provides the power to drive all of the system unit components.