電子信息專業(yè)英語(yǔ)復(fù)習(xí)題

1、As the voltage varies with time, the displacement of charge also varies with time, causing what is known as the displacement current. 當(dāng)電壓隨時(shí)間的變化、位移電荷也隨時(shí)間的變化而變化，造成所謂的位移電流。The device capable of doing this is called a capacitor. The ability of a capacitor to store electrical energy is termed capacitance

2、.該裝置能做這項(xiàng)被稱為電容。電容器的能力儲(chǔ)存電能被稱為電 容。Resistance is the capacity of materials to impede the flow of current or, more specifically, the flow of electric charge.電阻是材料的能力來(lái)阻礙電流的流動(dòng)，或者更確切地說(shuō)，電荷的流動(dòng)。Second, a current cannot change instantaneously in an inductor, that is, the current cannot change by a finite amount

3、 in zero time. 第二，電流不能改變瞬間在一個(gè)電感，也就是說(shuō)，當(dāng)前無(wú)法改變由有限零時(shí)間。Inductance is the property of oppsing any change of a current flowing through a coil.電感的屬性相對(duì)任何一個(gè)線圈通過(guò)電流的變化。Oppsing:adj.反對(duì)的；相對(duì)的；對(duì)面的 | v.反對(duì)Note from Eq(1.4) that the voltage across the terminals of an inductor is proportional to the time rate of change

4、of the current inthe inductor.注意從式(1.4)的電壓，一個(gè)電感的連接端子是成正比的變率的電 感電流。They occur in many, many applications and make possible circuits and subsystems that perform very useful functions.他們出現(xiàn)在許多，許多的應(yīng)用，使可能的電路和子系統(tǒng)，執(zhí)行非 常有用的功能。The cascaded gain and loss through the amplifier/feedback network must be greater t

5、han unity級(jí)聯(lián)增益，并通過(guò)放大器/反饋網(wǎng)絡(luò)的損失必須大于1In most oscillator circuits, oscillation builds up from zero when power is first applied, under linear circuit operation.在大多數(shù)振蕩器電路，建立了振動(dòng)從零功率時(shí)首次應(yīng)用，在線性電 路的操作。It is often encountered in engineering systems and commonly produced by the unbalance in rotating machinery, is

6、olation, earthquakes, bridges, buildings, control and automatization devices, just for naming a few examples.這是經(jīng)常遇到在工程系統(tǒng)和普遍的不平衡產(chǎn)生的旋轉(zhuǎn)機(jī)械、隔離、地震、橋梁、建筑、控制和自動(dòng)化設(shè)備，只是為了命名的一些例子。A relaxation oscillator is an oscillator in which a capacitor is charged gradually and then discharged rapidly.一個(gè)弛張振蕩器是其中一個(gè)電容充電逐步然后迅

7、速排出的振蕩器。The capacitor is charged through the resistor, causing the voltage across the capacitor to approach the charging voltage on an exponential curve.電容器充電通過(guò)電阻器，引起的電壓，電容器充電電壓的方法在一 個(gè)指數(shù)曲線。This field, also called a RF field or radio wave, can be used for wireless broadcasting and communications over

8、 a significant portion of the electromagnetic radiation spectrumfrom 9 Khz to thousands of Ghz.這一領(lǐng)域，也稱為射頻場(chǎng)或無(wú)線電波，可用于無(wú)線廣播通訊的一個(gè) 重要部分,電磁輻射頻譜從9千赫至成千上萬(wàn)的阻抗特性。Each of these bands, other than the lowest frequency segment, represents an increase of frequency corresponding to an order of magnitude (powe of ten

9、).這些頻段，最低的頻率段以外，代表頻率的增加，相應(yīng)的一個(gè)量 級(jí)(十鮑威)。The Decibel is the unit used to express relative differences in signal strength.分貝是單位用來(lái)表達(dá)相對(duì)差異的信號(hào)強(qiáng)度Since power is proportional to the square of a signal s amplitude（e.g., a power ratio of 100 is equivalent to an amplitude ratio of 10）.因?yàn)殡娏Φ钠椒匠烧龋盘?hào)的振幅（例句。，一個(gè)功率比10

10、0就相 當(dāng)于一個(gè)振幅比10）。For example, suppose that a signal that passes through two channel segments is first attenuated in the ratio of 20 to 1 on the first leg and 7 to 1 on the second.例如,假設(shè)一個(gè)信號(hào)，經(jīng)過(guò)兩個(gè)通道衰減段第一比率的20到1在第一回合7 - 1的第二個(gè).By combining a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT

11、89C51 is a powerful microcontroller（自微控制 器）which provides a highly-flexible and cost-effective solution to many embedded control applications.結(jié)合一個(gè)多才多藝的8位CPU與一閃一閃的單一晶片、愛(ài)特梅爾 是一個(gè)功能強(qiáng)大的單片機(jī)AT89C51為我們提供了一個(gè)高度靈活的和精打細(xì)算的解決許多嵌入式控制應(yīng)用。In addition, the AT89C51 is designed with static logic for operation down to ze

12、ro frequency and supports two software selectable power saving modes.此外，以AT89C51單片機(jī)為核心設(shè)計(jì)了靜態(tài)邏輯操作降至零頻率 和支持兩種軟件可節(jié)電模式。Port 0 is an 8-bit open-drain bi-directional I/O port. As an output port, each pin can sink 8 TTL inputs. When 1s are written to Port 0 pins , the pins can be used as high impedance inpu

13、ts.端口 0是一個(gè)8位漏極開路的端雙向I / O端口。作為一個(gè)輸出 端口，每個(gè)引腳可以吸收8個(gè)TTL輸入。當(dāng)1秒是寫給端口 0針、 針可作為高阻抗輸入。21)By the summer of 1973, Kahn and Cerf had worked out a fundamental reformulation, where the differences between network protocols were hidden by using a common internetwork 互聯(lián)網(wǎng)絡(luò)) protocol and instead of the network being

14、responsible for reliability, as in the ARPANET, the hosts became responsible.在1973年夏天，卡恩以及現(xiàn)想出了一個(gè)基本收入，在網(wǎng)絡(luò)協(xié)議之 間的差別是被使用了一個(gè)公共的網(wǎng)際協(xié)議 ，而網(wǎng)絡(luò)負(fù)責(zé)可靠性，如 在阿帕網(wǎng)，東道主成為負(fù)責(zé)任的Cerf credits Hubert Zimmerman and Louis Pouzin, designer of the CYCLADES network, with important influences on this design.?瑟夫歸功于休伯特齊默爾曼和路易普贊，的基克拉澤

15、斯網(wǎng) 絡(luò)設(shè)計(jì)師，這種設(shè)計(jì)上的重要影響。two tin cans and a stringOne popular saying has it that TCP/IP, the eventual product ofCerf and Kahn s work, will run over 一個(gè)流行的說(shuō)法,TCP /IP,最終產(chǎn)品的現(xiàn)和卡恩的工作，要超出 兩 個(gè)罐頭和一個(gè)字符串工There is even a implementation designed to run using homing pigeons, IP over Avian Carriers.甚至有設(shè)計(jì)運(yùn)行使用信鴿，超過(guò)禽流運(yùn)營(yíng)商的IP推行。Today sP networking represents a synthesis of several developments that began to evolve in the 1960s and 19