(完整版)電子信息專業(yè)英語復(fù)習(xí)題

1、1) As the voltage varies with time, the displacement of charge also varies with time, causing what is known as the displacement current. 當電壓隨時間的變化、位移電荷也隨時間的變化而變化，造成所謂的位移電流。2) The device capable of doing this is called a capacitor. The ability of a capacitor to store electrical energy is termed capac

2、itance.該裝置能做這項被稱為電容。電容器的能力儲存電能被稱為電 容。3) 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阻礙電流的流動，或者更確切地說，電荷的流動。4) Second, a current cannot change instantaneously in an inductor, that is, the current cannot change by a f

3、inite amount in zero time. 第二，電流不能改變瞬間在一個電感，也就是說，當前無法改變由有限零時間。5) Inductance is the property of oppsing any change of a current flowing through a coil.電感的屬性相對任何一個線圈通過電流的變化。Oppsing:adj.反對的；相對的；對面的 | v.反對6) Note from Eq(1.4) that the voltage across the terminals of an inductor is proportional to the ti

4、me rate of change of the current inthe inductor.注意從式 (1.4)的電壓 ,一個電感的連接端子是成正比的變率的電感電流。7) 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。8) ) The cascaded gain and loss through the amplifier/feedback

5、 network must be greater than unity級聯(lián)增益，并通過放大器/反饋網(wǎng)絡(luò)的損失必須大于 19) In 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,建立了振動從零功率時首次應(yīng)用,在線性電路的操作。10) It is often encountered in engineering systems and commonly produced by the un

6、balance in rotating machinery, isolation, 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)機械、隔離、地震、橋梁、建筑、控制和自動化設(shè)備,只是為了命名的一些例子。11) A relaxation oscillator is an oscillator in which a capacitor is charged gradually and then dis

7、charged rapidly.一個弛張振蕩器是其中一個電容充電逐步然后迅速排出的振蕩 奧 TFPTo12) The capacitor is charged through the resistor, causing the voltage across the capacitor to approach the charging voltage on an exponential curve.電容器充電通過電阻器，引起的電壓，電容器充電電壓的方法在一 個指數(shù)曲線。13) This field, also called a RF field or radio wave, can be use

8、d for wireless broadcasting and communications over a significant portion of the electromagnetic radiation spectrumfrom 9 Khz to thousands of Ghz.這一領(lǐng)域，也稱為射頻場或無線電波，可用于無線廣播通訊的一個 重要部分,電磁輻射頻譜從 9千赫至成千上萬的阻抗特性。14) Each of these bands, other than the lowest frequency segment, represents an increase of frequ

9、ency corresponding to an order of magnitude (powe of ten).這些頻段，最低的頻率段以外，代表頻率的增加，相應(yīng)的一個量 級(十鮑威)。15) The Decibel is the unit used to express relative differences in signal strength.分貝是單位用來表達相對差異的信號強度16) Since power is proportional to the square of a signal s amplitude（e.g., a power ratio of 100 is equi

10、valent to an amplitude ratio of 10）.因為電力的平方成正比，信號的振幅（例句。，一個功率比100就相 當于一個振幅比10）。17) 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)一個信號，經(jīng)過兩個通道衰減段第一比率的20到1在第一回合7 - 1的第二個.18) By combi

11、ning a versatile 8-bit CPU with Flash on a monolithic chip, the Atmel AT89C51 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)合一個多才多藝的8位CPU與一閃一閃的單一晶片、愛特梅爾 是一個功能強大的單片機AT89C51為我們提供了一個高度靈活的和精打細算的解決許多嵌入式控制應(yīng)用。19) In

12、addition, the AT89C51 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes.此外 ,以 AT89C51 單片機為核心設(shè)計了靜態(tài)邏輯操作降至零頻率和支持兩種軟件可節(jié)電模式。20) Port 0 is an 8-bit open-drain bi-directional I/O port. As an output port, each pin can sink 8 TTL inputs

13、. When 1s are written to Port 0 pins , the pins can be used as high impedance inputs.端口 0 是一個 8 位漏極開路的端雙向 I / O 端口。作為一個輸出端口 ,每個引腳可以吸收8 個 TTL 輸入。 當 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 protocol

14、s were hidden by using a common internetwork（ 互聯(lián)網(wǎng)絡(luò) ） protocol and instead of the network being responsible for reliability, as in the ARPANET, the hosts became responsible.在 1973 年夏天,卡恩以及現(xiàn)想出了一個基本收入,在網(wǎng)絡(luò)協(xié)議之間的差別是被使用了一個公共的網(wǎng)際協(xié)議 ,而網(wǎng)絡(luò)負責(zé)可靠性,如在阿帕網(wǎng) ,東道主成為負責(zé)任的22. Cerf credits Hubert Zimmerman and Louis Pouzin,

15、 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，的基克拉澤斯網(wǎng)絡(luò)設(shè)計師，這種設(shè)計上的重要影響。23. One popular saying has it that TCP/IP, the eventual product ofCerf and Kahn s work, will run over“ two tin cans and a string 一個流行的說法，TCP /IP,最終產(chǎn)品的現(xiàn)和卡恩的工作，要超出 兩 個罐頭和一個字符串 ” 。24. There is even a implementation designed to run using homing pigeons, IP over Avian Carriers.甚至有設(shè)計運行使用信鴿，超過禽流運營商的 IP 推行。25. Today sIP networking represents a synthesis of several developments that began to evolve in the 1960s and 1