电子与通信英语选择翻译
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一单元、 1.Mathematical modelling and(a developments in computer) 2.For an engineering (d the main objective) 3.Which one of the (c the exercises are only) 4.Which is not the (b geometry) 5.(a Fourier series) is vital to 二单元. 1.The theoretical foundation (c the theory of probability) 2.For engineering students (c interpretation) 3.Find which is not (b the number of bits used to ) 4In general, the behavior of (d probability density function) 2.Random variables with (c from uniformly distributed) 三单元. 1.An ideal operational amplifier has (a infinite gain, infinite bandwidth, infinite input) 2.One of the summing (b no current flows into ) 3.For an inverting amplifier (a the output voltage) 4.Which is not true (a it is of no use) 5.For a voltage follower (c it has unity gain) 四. 1.A continuous signal (a an analog signal) 2.A system is called (c additivity and homogeneity) 2.The unit impulse signal (b the differential of) 4.Which of the following statements best (b it is a linear) 5.Any signal can be (the sum of a series of shifted and scaled unit impulse function) 五、 1、 the beginning of (d.maxwell’s equations) 2.(b.george southword and )show experimentally 2、 basic cicuit theory(c.lower frequency) 4.advantage to using RF/microwaves (b.use a high-speed) 3、 RF/microwaves (c.modulating ) 6.microwaves clothes dryers are designed (resonance of conductive) 六. 1.By using the (b -5.25) The first step (c sample it at discrete_ 2.The following descriptions about (b the study of ) Regarding the advantages (a the transmission) 3.The application areas(b eognitive science) 七. 1.According to the author (b image processing are ) A logic place (a recognition of) 2.(b image enhancement) is one of Image restoration is (c image restoration is basically) 3.In the context (c involves extracting) According to the text (a is very complex) 十一. 1.The function of a (b to allow users) Which of the following about layering (b the input module) 2.The source (c convert the input) The analog signal waveform (d all of above) 3.The purpose of (c to place signal) In 2-PAM (d +-1) 4.When the receiving (b strips off the DLC header and trailer) 十二、 1.In order to form (b seven) The first commercially (b TDMA) In a CDMA (c special code) 2.The spreading factor(a the transmission) Which of the following statement about RAKE(c RAKE's) 3.In the uplink (b it can ensure) Spread-spectrum (d transform original) 4.When the network(d move some users to other less) 十三. 1.The ideal,originated with (c didn't have) (a infrared) light is chosen 2.The distinguishing characteristic (d use different wavelengths in different bands) 3.Which one of the (d no IPR) Which sentence is(c a receiver needs) 十四. 1.Internet was originally (b a small group) TCP/IP model (c layer 5 and layer 6) 2.(c network) layer transfers HTTP is used to (b transfer Web) TCP, as an (d all of above) 十五. 1.The component that is (b IPTVCD) In the digital (c transmitting only) A television gate (d all of above) 4.The media gateway (d end users) The function of IP(b transfer the television) 2. When sending the same (c multicast) For unicast transmission(c 20 Mbps) 3(1)The calculus微积分在解析几何的帮助下,被证明能够有效的解决许多早先无法解决的问题。 (2)Of the many 在17 世纪的许多重大数学发明中,毫无疑问最杰出的就是微积分。 (3)A great forward 当法国数学家奥古斯丁*路易斯*柯西发展相互一种可接受的极限理论,并由此定义了连续性,微分和极限概念下的定积分,这成为1821年数学史上的巨大飞跃。 4) Mathematical analysis数学分析是高等数学中的最重要分支中的一个,它的主要目的是研究变量和他们之间的关系。 5) The main purpose自然数学或技术科学的一个主要目的是建立考虑的过程中的变量之间的关系并用数学描述。 6)Mathematical methods数学方法是物理学、机械学、工程学和其他自然科学的基础,对所有学科来说,数学是有利的理论和应用工具,没有数学就不可能科学计算工学和技术。
Unit 2
1) A lot of描述精确的随机变量的分析需要许多信息,而且描述两个或以上变量的联合发布需要更多的信息 2) The binomial二项分布和泊松分布在所有离散分布中应用最广泛的,由于他们的概率分布在统计性质控制中的重要(作用),这种概率分布对工程人员来说是非常重要。 3) For any random对于任何随机变量,在两个点分布函数的差异是随机变量取这两点间(或端点)的值的概率 4) In general一般来说,随机事件的概率P在进行大量的重复实验时能以均值来确定,该事件发生的次数是p乘以实验次数 5) In statistics在统计学中,将任何观察过程叫做实验是一个习惯 6) If an event如果在特定的现实情况下,某时间确定不能发生,那么称之为不可能事件
Unit 3 4)When feedback is.当运放周围有反馈时,输入阻抗和反馈阻抗的比值决定了电路的闭环增益 6)The operational amplifier运放是个极为高效和通用的设备,它的应用范围覆盖了广阔的电导工业满足了特殊传输函数,模拟器件,模拟计算和特殊系统设计的需要。
Unit 4
1) If the input 如果一个线性系统的输入是正弦波,输出将也是正弦波,并且输出与输入频率相同。 2) Just as we正如我们能将任何信号解释成一系列尺度 位移变换的脉冲和一样,我们也能将任何信号分解成一系列不同频率的正弦(尺度和位移变换)的和 3) A signal一个信号被公式化成一个包含或多个变量的函数,并用于传达物理现象本质中的信息 4) Nyquist sampling采样定理说明:如果一个连续信号x(t)的最高频率fmax,那么如果采样频率fs大于2fmax,则x(t)可以由它的采样序列x(nT)完全恢复‘ 5) In fact事实上,如果离散时间序列是绝对可和的,那么在连续事件情况下,他的光谱就是一个有限且连续的函数。 6) Systems are如果每个有界输入都得到一个有界输出,那么系统是稳定的。如果H(x)的所有极点都在Z域的单位圆内,那么离散时间系统也是稳定的。