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河南师范大学-计算机科学与技术-专业英语
In ()transmission, data can be sent in both directions at the same time.
A.simplex
B.half-duplex
C.full-duplex
D.none of the above
A special sequence of number or letters that limits access to eletronic mail boxes:( ) A.Authentication B.code C.Encryption D.Password
program designed to destroy data on your computer which can travel to “infect ” other computers.( ) A.message B.information C.hacker D.virus
Internet is simply what? ( ) A.The WWW B.A worldwide system of computer networks C.A modem D.An ISP or Internet Service Provider
A computer calculate using the ( ) system. A.fast B.trianary C.hexadecimal D.binary
The “WWW”is exactly what?( ) A.A web of resources on the Internet that are accessed using HTTP. B.The internet C.An ISP or Internet Service Provider D.Internet
Digital data can be produced by all of the following expect (). A.a voice B.a computer C.a radio-wave D.a visual signal
() can be regarded as a general-purpose digital network capable of supporting a wide range of services such as voice, data and image. A.Local area networks B.Integrated services digital networks C.Packet switching networks D.Mobile communication networks
The principle of converting analog signals to digital signals became popular with the introduction of (). A.pulse code modulation B.packet switching technology C.quadrature amplitude modulation D.stored-program control
In a ()switching system, a call was established and routed in a set of progressive electromechnical steps, each under the direct control of the user ’ s dialing pulse. A.step-by-step B.crossbar C.stored-program-control D.manual
PC-to-PC networking could be easily accomplished between buildings (). A.on one campus B.between campuses C.a or b D.none of them
()are not utilized for the detection of the signal and the optical-electrical conversion. A.Light emitting diodes B.Phototransistors C.Photoconductors D.Photodiodes
The electrical transmission medium can consist of (). A.a pair of wires B.a coaxial cable C.a radio link through free space down D.all of above
There can be no doubt ()the 1900s is remembered as the electronic century. A.which B.that C.what D.all of above
The transmission method which uses start stop bits after each character is () A.synchronous B.asynchronous C.full duplex D.none of the above
A special sequence of number or letters that limits access to eletronic mail boxes:( ) A.Authentication B.code C.Encryption D.Password
program designed to destroy data on your computer which can travel to “infect ” other computers.( ) A.message B.information C.hacker D.virus
Internet is simply what? ( ) A.The WWW B.A worldwide system of computer networks C.A modem D.An ISP or Internet Service Provider
A computer calculate using the ( ) system. A.fast B.trianary C.hexadecimal D.binary
The “WWW”is exactly what?( ) A.A web of resources on the Internet that are accessed using HTTP. B.The internet C.An ISP or Internet Service Provider D.Internet
Digital data can be produced by all of the following expect (). A.a voice B.a computer C.a radio-wave D.a visual signal
() can be regarded as a general-purpose digital network capable of supporting a wide range of services such as voice, data and image. A.Local area networks B.Integrated services digital networks C.Packet switching networks D.Mobile communication networks
The principle of converting analog signals to digital signals became popular with the introduction of (). A.pulse code modulation B.packet switching technology C.quadrature amplitude modulation D.stored-program control
In a ()switching system, a call was established and routed in a set of progressive electromechnical steps, each under the direct control of the user ’ s dialing pulse. A.step-by-step B.crossbar C.stored-program-control D.manual
PC-to-PC networking could be easily accomplished between buildings (). A.on one campus B.between campuses C.a or b D.none of them
()are not utilized for the detection of the signal and the optical-electrical conversion. A.Light emitting diodes B.Phototransistors C.Photoconductors D.Photodiodes
The electrical transmission medium can consist of (). A.a pair of wires B.a coaxial cable C.a radio link through free space down D.all of above
There can be no doubt ()the 1900s is remembered as the electronic century. A.which B.that C.what D.all of above
The transmission method which uses start stop bits after each character is () A.synchronous B.asynchronous C.full duplex D.none of the above