2010-2011科技英语(三上)补考标准答案.doc

诚信保证本人知晓我校考场规则和违纪处分条例的有关规定，保证遵守考场规则，诚实做人。 本人签字： 编号： 西北工业大学补考试题（标准答案及评分标准）2010 2011 学年 第 一 学期开课学院 自动化学院 课程 科技英语（一） 学时 32 考试日期 2011年3月9日 考试时间2 小时 考试形式（闭）卷 题号一二三四五六七总分得分考生班级学号姓名一、短语英译汉（20分）1、absolute permeability 绝对磁导率2、normal component 法线方向分量3、hysteresis loop 磁滞环4、available precision 可用精度5、calculation-intensive algorithm 运算密集型算法6、smallest Resolvable Difference 最小分辨率7、performance specifications 性能指标8、converter resolution 转换器分辨率9、bipolar junction transistor (BJT) 双极性晶体管 10、source follower circuit 信号源跟随电路11、transconductance model 跨导模型注：1. 命题纸上一般不留答题位置，试题请用小四、宋体打印且不出框。2. 命题教师和审题教师姓名应在试卷存档时填写。 共6页第1页西北工业大学命题专用纸12、anti-aliasing filter 抗混叠滤波器13、sampling rates 采样率14、successive approximation 逐次逼近法15、digital filtering 数字滤波16、multi-function instructions 多功能指令17、static transformer 静态变压器18、looping scheme 循环机制19、self-bias resistor 自偏电阻20、Arithmetic Logical Unit 运算逻辑单元20分，每小题各1分，共20分二、短语汉译英（20分）1、剩余磁通密度 residual flux density2、外设 peripheral sections 3、过采样 Over-sampling 4、小信号放大器 small signal amplifier 5、共栅极 common gate6、输出频谱 output spectrum 7、模数转换器 Analog to Digital Converters 8、印刷电路板 printed circuit board 9、矫顽磁力 coercive force 10、磁路 magnetic circuit 20分，每小题各2分，共20分。可酌情考虑写对部分单词给1分。教务处印制 共6页第2页三、短文（40分）1、Figure 2.6 shows the output spectrum of a typical flash converter as determined by taking an FFT (Fast Fourier Transform) of the converter output samples for a pure sine wave input. One thing is immediately apparent. The spectrum does not simply consist of the pure input sine wave component, but also has a mass of other components spread throughout the measurement band. These largely arise from the inevitable quantization error (noise), because the converter is trying to represent the analog input level from a finite number of available sample values (dictated by the number of bits in the ADC).10分。共4句，第1、3、4句各3分；第2句1分。图2.6显示了一个典型的闪式ADC的输出频谱。它是通过对ADC转换后的纯正弦样本进行快速傅里叶变换（FFT）得到的。可以立即明确的是：频谱不是简单地由输入正弦分量组成的，还有一些分布在测量带宽内的其他分量。这些分量主要来自不可避免的量化误差（噪声）。这是因为转换器试图使用有限个可用样值（由ADC位数决定）来代表模拟输入电平。2、DSPs can be purchased in three forms, as a core, as a processor, and as a board level product. In DSP, the term core refers to the section of the processor where the key tasks are carried out, including the data registers, multiplier, ALU, address generator, and program sequencer. A complete processor requires combining the core with memory and interfaces to the outside world. While the core and these peripheral sections are designed separately, they will be fabricated on the same piece of silicon, making the processor a single integrated circuit.10分。共4句，第1、3句各2分；第2、4句各3分。教务处印制 共6页第3页购买数字信号处理器有三种方式：购买内核、购买处理器和购买板级产品。在数字信号处理器中，“内核”这个词是指处理器中运行关键任务的部分；它包括数字寄存器、乘法器、运算逻辑单元、地址产生器和程序定序器。一个完整的处理器需要将内核、存储器和外部接口组合起来。尽管内核设计和片内外设是分开进行的，但是却被制作在同一片硅片上；这样，处理器就能成为单片集成电路。3、CC and CD Amplifiers. The common terminal 2 configuration is used mainly as a buffer amplifier between a signal source and a low impedance load. As a buffer amplifier, the circuit allows the signal to be transferred to the load while preventing the load from directly affecting the source. The main characteristics of this amplifier configuration are, high to very high input resistance, low to very low output resistance, and a voltage gain which is close to, but always lower than, unity. The output voltage follows the input voltage, and for this reason the circuits are also known as Emitter Follower, and Source Follower circuits.10分。共5句，第1句1分；第2、3、5句各2分；第4句3分。CC和CD放大器：其为共用端2组态，主要用作信号源与低阻抗负载之间的缓冲放大器。作为缓冲放大器，该线路可允许信号传输给负载，又可防止负荷直接影响信号。该放大器组态的主要特征是，高至极高的输入电阻，低至极低的输出电阻，以及具有一个接近但总是小于1的电压增益。输出电压“跟随”输入电压，因此，该电路也称为射极跟随器和信号源跟随电路。4、On the other hand, in other devices an air gap may be intentionally inserted in order to mask the nonlinear relationship existing between B and H. But in spite of the presence of air gaps it happens that the space occupied by the magnetic field and the space occupied by the ferromagnetic material are practically the same. Usually this is because air gaps are made as small as教务处印制 共6页第4页mechanical clearance between rotating and stationary members will allow and also because the iron by virtue of its high permeability confines the flux to itself as copper wire confines electric current or a pipe restricts water.10分。共3句，第1句2分；第2、3句各4分。另外，在其他设备中，间隙是人为预留的，以消除B和H之间的非线性关系。尽管有间隙存在，是由磁场充满，还是由铁磁性介质充满空间的情况是相同的。通常这是因为间隙与机械静止部件与旋转部件之间允许的缝隙一样小；还因为铁的高磁导率将磁通局限在本身内部，这类似于铜导线限制电流，管道限制水流。四、分析句子语法结构并翻译（20分）1、As we know, the AC voltage generated in each rotating armature coil is converted to DC in the external armature terminals by means of a rotating commutator and stationary brushes to which the armature leads are connected.generated in each rotating armature coil过去分词短语作定语修饰本句的主语the AC voltage。by means of指明手段及方法，which引出的定语从句修饰stationary brushes，to是connected要求的。我们知道，每个旋转的电枢绕组中产生的交流电压，经由一与电枢联接的旋转的换向器和静止的电刷；在电枢绕组出线端转换成直流电压。共10分。语法分析5分；句子翻译5分。2、The flash converter operates by simultaneously presenting the input signal to a bank of comparators, whose reference voltages are set by a resistor chain to exactly correspond to all of