3. www.asp.com is an E-mail address.（ ） A. 错误 B. 正确 ...

18. （ ）(Pravate Key),in encryption, one key is used to both lock and unlock data. Compare with public key. A. Asymmetric key B. Symmetric key C. Coputer virus D. Digital signatures ...

13. （ ） (Motion Picture Experts Group) standards are the main algorithms used to compress videos.Due to the fact that movies contain both images and sound, it can compress both audio and video. A. JPEG B. MPEG C. MIDI D. none of the ...

8. （ ）, technological and managerial procedures applied to computer systems to ensure the availability, integrity and confidentiality of information managed by the computer system. A. Computer Security B. Digital signatures C. Compute...

3. （ ） is a computer technology that creates three dimensional real illusion in an artificial world. A. Vector image B. Bitmap C. JPEG D. Virtual Reality ...

19. （ ）, type of network in which all communications devices are connected to a common channel, with no central server. A. Bus network B. Star network C. Ring network D. none of the above ...

11. （ ）, short for modulator/demodulator, device that converts digital signals into a representation of analog form(modulation) to send over phone lines;a receiving modem then converts the analog signal back to a digital signal(demodulat...

6. （ ） is a subclass of software. It consists of a collection of programs that control the operations of a computer and its devices. It servers as the interface between the user and the computer hardware. A. System software B. Applicat...

19. The common input devices are the （ ）and the keyboard. A. printer B. speaker C. monitor D. mouse ...

12. （ ）(Reduced Instruction Set Computer) refers to processors that support fewer instructions than CISC chips. The reduced number of instructions enables them to execute instructions faster. A. CISC B. RISC C. RAM D. ROM ...