【简答题】Addison Heard uses an image of his wife and infant son for the background on his laptop. An MBA student at the University of Virginia's Darden School of Business, Heard thinks about his family constan...
【单选题】Canesta Company has developed a virtual keyboard out of light to be used with cell phones and personal digital assistants (PDAs). The product beams an image of a keyboard on a desk, allowing the user ...