Input to the computer and output from the computer are provided by periheral devices which have many diffent purpose.Most essential of all is the console terminal which provides communication between the user and the computer.Typically this is a keyboard plus either a video display device of a printing type output device.Other peipheral devices include communiction equipments which permit transfer of data over telephone lines to and from distans computers.In a lab or in a manufacturing environment analog signals from volatge and current sources as well as electrical signals indicating pressure or temperature can be digitized by an "Analog to Digital converter"and presented to the computer ad binary numbers.Sinmilary binary om the computer can be conberted to an analog votage by a "digital to analog converter',Digital recording of music uses these principles Graphics terminals permit interacive presentaion of information in the form of bar graphs and maps as well as drawings for electronic and mechanical parts,Mechanical parts can be designed using a graphics terminal,then mathmatically subjected to stress analysisi to determinaks weak points.A modified design can then be produced in hours rather than days or weeks.All this is possible through the use of these specialized peripheral decviece plus the supporting software of program to control them .Computer Assisted Design encompassed the above processed and equipment.1 Analog signals___A can be converted to binary numbersB can be digitized by a Digital to Analog conberterC can be digitized by a video dispaly converterD can be digitized by keyboard2 which statement is trueA analog signals can not indicated temperatureB the output of "digitao to analog converter"is analog signalC Graphics terminals prohibit interaticer prestentation of information in the form of bar garaphs and mapsD computer Assisted Design do not need any peripheral device

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Input to the computer and output from the computer are provided by peripheral devices which have many different purpose。 Most essential of all is the console terminal which provides communication between the user and the computer。 Typically this is a keyboard plus either a video display device of a printing type output device。 Other peripheral devices include communication equipments which permit transfer of data over telephone lines to and from distant computers。 In a lab or in a manufacturing environment analog signals from voltage and current sources as well as electrical signals indicating pressure or temperature can be digitized by an "Analog to Digital converter" and presented to the computer as binary numbers。 Similar binary data, from the computer can be converted to an analog voltage by a "digital to analog converter"。 Digital recording of music uses these principles。 Graphics terminals permit interactive presentation of information in the form of bar graphs and maps as well as drawings for electronic and mechanical parts。 Mechanical parts can be designed using a graphics terminal, then mathematically subjected to stress analysis to determine weak points。 A modified design can then be produced in hours rather than days or weeks。 All this is possible through the use of these specialized peripheral device plus the supporting software of program to control them。 Computer Assisted Design encompassed the above processed and equipment。 1 Analog signals___ A can be converted to binary numbers B can be digitized by a Digital to Analog converter C can be digitized by a video display converter D can be digitized by keyboard 2 which statement is true A analog signals can not indicate temperature B the output of "digital to analog converter" is analog signal C Graphics terminals prohibit interactive presentation of information in the form of bar graphs and maps D computer Assisted Design do not need any peripheral device輸入計算機和從計算機輸出是由許多不同外圍設備所提供。最基本的是提供在用戶和計算機間通信的控制臺終端。這典型地是一個鍵盤加上一視頻顯示器或者一打印輸出設備。其它外圍設備包括通過電話線進行調動遠程的數據的計算機通訊器材。在實驗室或在制造環境中，從電壓和電流源模擬信號及表明壓力或溫度的電子信號可由" 模擬信號及數字信號交換器"數字化，并被作為二進制輸入計算機。相似的，從計算機來的二進制數據可以被" 數字信號與模擬信號交換器"轉換成模式電壓。數字記錄音樂就使用這類外圍設備。圖表終端允許信息以條線圖及地圖出現，也可以畫成電子圖及機械零件圖。機械零件也能使用圖表終端來設計,然后通過計算進行強度分析并確定脆弱點。一個被修改的設計可能然后在幾小時后就制造出來，而不是等幾天或幾星期。所有這些在使用這些專用外圍設備加上控制他們適當支持軟件時是可能的。計算機輔助設計包含上述處理和設備。1 模擬信號___ A 可能被轉換成數字信號B 可能由數字化對模擬信號交換器C 可能由一臺視頻顯示器交換成數字D 數字化可能由鍵盤實施答案是A，2那個答案屬實A 模擬信號不能表明的溫度B " 數字式對類似物交換器" 輸出的是模擬信號C 圖表終端禁止信息以條線圖的形式與地圖形式交互輸出D 計算機輔助設計不需要任何外圍設備答案是B。