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 ...

8. Electronic Commerce means buying and selling products and services online via the Internet.( ) A. 错误 B. 正确 ...

3. TCP/IP is the suite of communications protocols used to connect computers on the Internet.( ) A. 错误 B. 正确 ...

18. In ( ) mode, the communication is unidirectional, like a one-way street. Only one of the two stations on a link can transmit;the other can only receive. A. half-duplex B. full-duplex C. simplex D. none of the above ...

8. A ( ) channel allows simultaneous message exchange in both directions.It really consists of two simplex channels, a forward channel and a reverse channel,linking the same points. A. half-duplex B. full-duplex C. simplex D. none ...

3. A ( ) is a highly intelligent device that supports connectivity between both like and unlike LANs,and between LANs and WANs or MANs. A. router B. repeater C. switch D. bridge ...

8. LAN, communications network that covers a wide geographical area, such as a state or a country.( ) A. 错误 B. 正确 ...

3. Bridge, interface that enables WANs to communicate.( ) A. 错误 B. 正确 ...

18. A ( ) is an electronic device that operates under the control of instructions stored in its own memory, which can according to specified rules, produce results,and store the results for future use. A. computer B. CPU C. input de...

13. ( ) have more storage capacity than diskettes and also offer faster access to the data they hold. A. Hard disks B. Optical disks C. Zip disk D. CD ...