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河南师范大学-计算机科学与技术-专业英语
Analog multimeter
Semiconductor material
chip holders
peak-to-peak voltage
dual-trace oscilloscope
flowchart
signal generator
switch
device
instruction
junction
combination
Upgrade a computer You can Upgrade a computer to enhance it ’s 1 .. For many upgrades,you will need the assistance of an experienced computer 2 erson.Upgrading usually refer to replacing an old or obsolete computer with a newer one to improve the efficiency of the computer.Upgrading can also include adding a new 3 ,such as a tape drive or DVD-ROM drive,to increse the capabilities of the computer. You should always determine the cost of an upgrade before performing it.If you are planning a major upgrade,such as the system board or CPU ,it may be less expensive to purchase a new computer. Increasing the 5 of memory in a computer is one of the most effetive upgrade you can perform.Doubling the existing memory in a computer can significantly increase its performance. 1.A.cost B.height C. performance D.experience 2. A.repair B.check C.administer D.keep 3.A.member B.tape C.drive D. component 4.A.replace B.replacing C.to replace D.replaced 5. A. amount B.cost C.speed D.quality
[阅读题,8.3分] The higher the frequency of the analogue signal, the more often it must be sampled. However, it is usually adequate to sample a signal at twice its highest frequency. Each binary digit used to show a binary bits used by the ADC. If the conversion is made using a four-bit ADC, only sixteen different binary values can be produced. The smallest value is 0000 and the largest is 1111. If an 8-bit ADC is used, then 256 different digital values can be produced. When a measurement of the analogue signal does not coincide with one of these binary values, it must be rounded up or down. 1) If the analogue signal is u=sin(200 t), then the adequate sampling frequency must be more than () A .50Hz. B.200 Hz C.100 Hz D.50 Hz 2) If the conversion is made using a ten-bit ADC, different binary values can be produced. () A. 1024 B.512 C. 256 D.10
The traditional mechanical wristwatch uses a balance wheel and hairspring to keep time. In a digital watch these mechanical parts have been replaced by vibrating quartz crystal controlled by minute electronic circuits. The artificial quartz crystals used in digital watches are designed to vibrate up to 32768 cycles per second when the current from a battery is passed through them. These vibrations produce electric pulses. As the pulses travel through the electronic circuits of the microchip, their rate is gradually halved. The result creates a pulse rate of one per second. Each one –second pulse triggers the microchip to send signal to the digital display to advance the numerals by one second. The pulses are also used to control different functions such as the hour display, date and alarm signal. 1) The best title of this article is () A. Mechanical wristwatch. B. Digital Watch C. Electronic circuits D. Counter 2) How many times do the electronic circuits of the microchip halve when creating a pulse rate of one per second? () A. 10 B.15 C.13 D.12
Semiconductor material
chip holders
peak-to-peak voltage
dual-trace oscilloscope
flowchart
signal generator
switch
device
instruction
junction
combination
Upgrade a computer You can Upgrade a computer to enhance it ’s 1 .. For many upgrades,you will need the assistance of an experienced computer 2 erson.Upgrading usually refer to replacing an old or obsolete computer with a newer one to improve the efficiency of the computer.Upgrading can also include adding a new 3 ,such as a tape drive or DVD-ROM drive,to increse the capabilities of the computer. You should always determine the cost of an upgrade before performing it.If you are planning a major upgrade,such as the system board or CPU ,it may be less expensive to purchase a new computer. Increasing the 5 of memory in a computer is one of the most effetive upgrade you can perform.Doubling the existing memory in a computer can significantly increase its performance. 1.A.cost B.height C. performance D.experience 2. A.repair B.check C.administer D.keep 3.A.member B.tape C.drive D. component 4.A.replace B.replacing C.to replace D.replaced 5. A. amount B.cost C.speed D.quality
[阅读题,8.3分] The higher the frequency of the analogue signal, the more often it must be sampled. However, it is usually adequate to sample a signal at twice its highest frequency. Each binary digit used to show a binary bits used by the ADC. If the conversion is made using a four-bit ADC, only sixteen different binary values can be produced. The smallest value is 0000 and the largest is 1111. If an 8-bit ADC is used, then 256 different digital values can be produced. When a measurement of the analogue signal does not coincide with one of these binary values, it must be rounded up or down. 1) If the analogue signal is u=sin(200 t), then the adequate sampling frequency must be more than () A .50Hz. B.200 Hz C.100 Hz D.50 Hz 2) If the conversion is made using a ten-bit ADC, different binary values can be produced. () A. 1024 B.512 C. 256 D.10
The traditional mechanical wristwatch uses a balance wheel and hairspring to keep time. In a digital watch these mechanical parts have been replaced by vibrating quartz crystal controlled by minute electronic circuits. The artificial quartz crystals used in digital watches are designed to vibrate up to 32768 cycles per second when the current from a battery is passed through them. These vibrations produce electric pulses. As the pulses travel through the electronic circuits of the microchip, their rate is gradually halved. The result creates a pulse rate of one per second. Each one –second pulse triggers the microchip to send signal to the digital display to advance the numerals by one second. The pulses are also used to control different functions such as the hour display, date and alarm signal. 1) The best title of this article is () A. Mechanical wristwatch. B. Digital Watch C. Electronic circuits D. Counter 2) How many times do the electronic circuits of the microchip halve when creating a pulse rate of one per second? () A. 10 B.15 C.13 D.12