单选题 The dissemination of any form of radio electric communications by means of Hertzian waves intended to be received by the public.

单选题 Integrated circuits did for the third - generation what transistors did for the ____ generation.

单选题 The digital computer is a digital system performs various ____ tasks.

单选题 A device that converts a signal whose input is information in the analog form and whose output is the same information in digital form.

单选题 The process of identifying an individual,usually based on a username and password.

单选题 Mainframe computer is a powerful ____ computer.

单选题 The CPU mounts in a special socket that uses a latching mechanism to hole it ____ .

单选题 Also called end - user programs,includes database programs,word processors,and spreadsheets.