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河南师范大学-计算机科学与技术-专业英语
The term modem is derived from the words ()modulate emphasis
A.all
B.modular emulation
C.multiplex or demultiplex
D.modulate demodulate
A ()amplifier provides signal amplification with little or no distortion, so that the output is proportional to the input. A.nonlinear B.linear C.electronic D.all of above
In a diode, current flows in ()direction across the junction. A.only one B.two C.three D.all of above
An electronic device often used for amplifying voltage and current is (). A.transistor B.conductor C.diode D.all of above
For a 4-band resistor with “color code ”, the first band is the ()values. A.hundreds B.tens C.ten D.all of above
A capacitor will block ()current, but appears to pass ()current by charging and discharging. A.DC …IC B.AC …DC C.DC …. AC D.all of above
The sixth power of two is (). A.12 B.36 C.64 D.all of above
Frequency is the reciprocal of the period, if the period is 4ms, then the frequency would be (). A.4m/s B.0.25KHz C.25Hz D.all of above
A resistor is an electrical component that ()the flow of electrical current. A.increases B.changes C.resists D.all of above
Electrons, as one knows, are minute ()charge of electricity. A.negative B.positive C.reverse D.all of above
Which of the following is an “output device? ”( ) A.CD ROM B.Microphone C.Printer D.All the above
The software used to control the computer and run programs.( ) A.application B.systew software C.games D.virus
Passive electrical circuits
Assembler language
The address bus
A ()amplifier provides signal amplification with little or no distortion, so that the output is proportional to the input. A.nonlinear B.linear C.electronic D.all of above
In a diode, current flows in ()direction across the junction. A.only one B.two C.three D.all of above
An electronic device often used for amplifying voltage and current is (). A.transistor B.conductor C.diode D.all of above
For a 4-band resistor with “color code ”, the first band is the ()values. A.hundreds B.tens C.ten D.all of above
A capacitor will block ()current, but appears to pass ()current by charging and discharging. A.DC …IC B.AC …DC C.DC …. AC D.all of above
The sixth power of two is (). A.12 B.36 C.64 D.all of above
Frequency is the reciprocal of the period, if the period is 4ms, then the frequency would be (). A.4m/s B.0.25KHz C.25Hz D.all of above
A resistor is an electrical component that ()the flow of electrical current. A.increases B.changes C.resists D.all of above
Electrons, as one knows, are minute ()charge of electricity. A.negative B.positive C.reverse D.all of above
Which of the following is an “output device? ”( ) A.CD ROM B.Microphone C.Printer D.All the above
The software used to control the computer and run programs.( ) A.application B.systew software C.games D.virus
Passive electrical circuits
Assembler language
The address bus