專業(yè)英語(yǔ)P1U1教學(xué)課件

1、自動(dòng)化專業(yè)英語(yǔ)教程自動(dòng)化專業(yè)英語(yǔ)教程教學(xué)課件July 28, 2007Email : http: / P1U1A Electrical Networks 第一部分第一單元課文第一部分第一單元課文A 電路電路A A 電路電路1.1.課文內(nèi)容簡(jiǎn)介：主要介紹專業(yè)基礎(chǔ)課課文內(nèi)容簡(jiǎn)介：主要介紹專業(yè)基礎(chǔ)課電路電路中的無(wú)源元件中的無(wú)源元件 和有源元件，基爾霍夫第一定律，由電阻、電容、電感和直和有源元件，基爾霍夫第一定律，由電阻、電容、電感和直 流電壓源串聯(lián)組成的二階電路等。流電壓源串聯(lián)組成的二階電路等。2.2.溫習(xí)溫習(xí)電路電路中分析電路的節(jié)點(diǎn)電壓法和回路電流法。中分析電路的節(jié)點(diǎn)電壓法和回路電流法。3.3.生

2、詞與短語(yǔ)生詞與短語(yǔ) network n. 網(wǎng)絡(luò)，電路網(wǎng)絡(luò)，電路 resistor n. 電阻器電阻器 inductor n. 電感器電感器 capacitor n. 電容器電容器 passive network 無(wú)源網(wǎng)絡(luò)無(wú)源網(wǎng)絡(luò) active network 有源網(wǎng)絡(luò)有源網(wǎng)絡(luò) characteristic adj. 特性特性(的的)；n. 特性曲線特性曲線 Ohm n. 歐姆歐姆 Faraday n. 法拉第法拉第 electric charge 電荷電荷 Integral intigrl n. 積分積分 increment inkrimnt n. 增量增量 armature :mtju n.

3、 電樞，銜鐵，加固電樞，銜鐵，加固 aforementioned adj. 上述的，前面提到的上述的，前面提到的 represent v. 代表，表示，闡明代表，表示，闡明 amplify v. 放大放大 Symbolic simblik adj. 符號(hào)的，記號(hào)的符號(hào)的，記號(hào)的 mesh n. 網(wǎng)孔網(wǎng)孔 P1U1A Electrical Networks 第一部分第一單元課文第一部分第一單元課文A 電路電路P1U1A Electrical Networks 第一部分第一單元課文第一部分第一單元課文A 電路電路 Kirchhoffs first law 基爾霍夫第一定律基爾霍夫第一定律 loop

4、 current 回路電流回路電流 voltage drop 電壓降電壓降 in series 串聯(lián)串聯(lián) differential dfrenl adj. 微分的；微分的；n. 微分微分 variable n. 變量變量 outline n. 輪廓；輪廓；v. 提出提出的要點(diǎn)的要點(diǎn) eliminate ilimineit v. 消除，對(duì)消消除，對(duì)消P1U1A Electrical Networks 第一部分第一單元課文第一部分第一單元課文A 電路電路4. 難句翻譯難句翻譯1 In the case of a resistor, the voltage-current relationship

5、is given by Ohms law, which states that the voltage across the resistor is equal to the current through the resistor multiplied by the value of the resistance. 就電阻來(lái)說(shuō)，電壓就電阻來(lái)說(shuō)，電壓電流的關(guān)系由歐姆定律決定。歐姆定電流的關(guān)系由歐姆定律決定。歐姆定律指出：電阻兩端的電壓等于電阻上流過(guò)的電流乘以電阻律指出：電阻兩端的電壓等于電阻上流過(guò)的電流乘以電阻值。值。 Which做關(guān)系代詞，以引出非限制性定語(yǔ)從句。做關(guān)系代詞，以引出非限制性定

6、語(yǔ)從句。P1U1A Electrical Networks 第一部分第一單元課文第一部分第一單元課文A 電路電路2It may be that the inductor voltage rather than the current is the variable of interest in the circuit. 或許在電路中，人們感興趣的變量是電感電壓而不是電感或許在電路中，人們感興趣的變量是電感電壓而不是電感電流。電流。 It用于加強(qiáng)語(yǔ)氣，其基本句型是用于加強(qiáng)語(yǔ)氣，其基本句型是“It is(或或was) that(強(qiáng)強(qiáng)調(diào)人時(shí)可用調(diào)人時(shí)可用who) ”Electrical Networ

7、ks An electrical circuit or networks is composed of elements such as resistors, inductors, and capacitors connected together in some manner. If the network contains no energy sources, such batteries or electrical generators, it is known as a passive network. On the other hand, if one or more energy

8、sources are present, the resultant combination is an active network. In studying the behavior of an electrical network, we are interested in determining the voltages and currents that exist within the circuit. Since a network is composed of passive circuit elements, we must first define the electric

9、al characteristics of these elements.energy sources能源能源electrical generators發(fā)電機(jī)發(fā)電機(jī)passive network 無(wú)源網(wǎng)絡(luò)無(wú)源網(wǎng)絡(luò)active network有源網(wǎng)絡(luò)有源網(wǎng)絡(luò)behavior特性，性能特性，性能passive circuit elements無(wú)源電路元件無(wú)源電路元件Electrical Networks An electrical circuit or networks is composed of elements such as resistors, inductors, and capaci

10、tors connected together in some manner. If the network contains no energy sources, such batteries or electrical generators, it is known as a passive network. On the other hand, if one or more energy sources are present, the resultant combination is an active network. In studying the behavior of an e

11、lectrical network, we are interested in determining the voltages and currents that exist within the circuit. Since a network is composed of passive circuit elements, we must first define the electrical characteristics of these elements. 電路或電網(wǎng)絡(luò)由以某種方式連接的電阻器、電感器和電電路或電網(wǎng)絡(luò)由以某種方式連接的電阻器、電感器和電容器等元件組成。如果網(wǎng)絡(luò)不包含

12、能源，如電池或發(fā)電機(jī)，容器等元件組成。如果網(wǎng)絡(luò)不包含能源，如電池或發(fā)電機(jī)，那么就被稱作那么就被稱作無(wú)源網(wǎng)絡(luò)無(wú)源網(wǎng)絡(luò)。換句話說(shuō)，如果存在一個(gè)或多個(gè)能。換句話說(shuō)，如果存在一個(gè)或多個(gè)能源，那么組合的結(jié)果為源，那么組合的結(jié)果為有源網(wǎng)絡(luò)有源網(wǎng)絡(luò)。在研究電網(wǎng)絡(luò)的特性時(shí)，。在研究電網(wǎng)絡(luò)的特性時(shí)，我們感興趣的是確定電路中的電壓和電流。因?yàn)榫W(wǎng)絡(luò)由無(wú)源我們感興趣的是確定電路中的電壓和電流。因?yàn)榫W(wǎng)絡(luò)由無(wú)源電路元件組成，所以必須首先定義這些元件的電特性。電路元件組成，所以必須首先定義這些元件的電特性。 In the case of a resistor, the voltage-current relationshi

13、p is given by Ohms law, which states that the voltage across the resistor is equal to the current through the resistor multiplied by the value of the resistance. Mathematically, this is expressed as ui R (1)where u=voltage, V; i=current, A; R=resistance, . Ohms law歐姆定律歐姆定律 In the case of a resistor,

14、 the voltage-current relationship is given by Ohms law, which states that the voltage across the resistor is equal to the current through the resistor multiplied by the value of the resistance. Mathematically, this is expressed as ui R (1)where u=voltage, V; i=current, A; R=resistance, . 就電阻來(lái)說(shuō)，電壓就電阻

15、來(lái)說(shuō)，電壓-電流的關(guān)系由歐姆定律給出，歐姆定律電流的關(guān)系由歐姆定律給出，歐姆定律指出：電阻兩端的電壓等于電阻上流過(guò)的電流乘以電阻值。指出：電阻兩端的電壓等于電阻上流過(guò)的電流乘以電阻值。在數(shù)學(xué)上表達(dá)為：在數(shù)學(xué)上表達(dá)為： u = iR (1-1A-1) 式中式中 u=電壓，伏特；電壓，伏特；i =電流，安培；電流，安培；R = 電阻，電阻，歐姆歐姆。 The voltage across a pure inductor is defined by Faradays law, which states that the voltage across the inductor is proportio

16、nal to the rate of change with time of the current through the inductor. Thus we have diuLdt(2)where di/dt =rate of change current, A/s; L=inductance, H. Faradays law法拉第定律法拉第定律proportional to與與成正比成正比 The voltage across a pure inductor is defined by Faradays law, which states that the voltage across

17、the inductor is proportional to the rate of change with time of the current through the inductor. Thus we have diuLdt(2)where di/dt =rate of change current, A/s; L=inductance, H. 純電感電壓由法拉第定律定義，法拉第定律指出：電感純電感電壓由法拉第定律定義，法拉第定律指出：電感兩端的電壓正比于流過(guò)電感的電流隨時(shí)間的變化率。因此兩端的電壓正比于流過(guò)電感的電流隨時(shí)間的變化率。因此可得到：可得到：tiLudd式中式中 di/d

18、t = 電流變化率，電流變化率， 安培安培/秒；秒； L = 感應(yīng)系數(shù)，感應(yīng)系數(shù)， 享利。享利。 (1-1A-2) The voltage developed across a capacitor is proportional to the electric charge q accumulating on the plates of the capacitor. Since the accumulation of charge may be expressed as the summation, or integral, of the charge increments dq, we ha

19、ve the equation 1udqC (3) where the capacitance C is the proportionality constant relating voltage and charge. By definition, current equals the rate change of charge with time and is express as i=dq/dt. developed建立建立accumulating累積累積integral積分積分proportionality constant比例常數(shù)比例常數(shù)increments增量增量 The volt

20、age developed across a capacitor is proportional to the electric charge q accumulating on the plates of the capacitor. Since the accumulation of charge may be expressed as the summation, or integral, of the charge increments dq, we have the equation 1udqC (3) where the capacitance C is the proportio

21、nality constant relating voltage and charge. By definition, current equals the rate change of charge with time and is express as i=dq/dt. 電容兩端建立的電壓正比于電容兩極板上積累的電荷電容兩端建立的電壓正比于電容兩極板上積累的電荷q 。因?yàn)殡姾傻姆e累可表示為電荷增量。因?yàn)殡姾傻姆e累可表示為電荷增量dq的和或積分，因此得的和或積分，因此得到的等式為到的等式為 ： 式中電容量式中電容量C是與電壓和電荷相關(guān)的比例常數(shù)。由定義是與電壓和電荷相關(guān)的比例常數(shù)。由定義可知

22、，電流等于電荷隨時(shí)間的變化率，可表示為可知，電流等于電荷隨時(shí)間的變化率，可表示為i = dq/dt。 Thus an increment of charge dq is equal to the current multiplied by the corresponding time increment, or dq=Idt. Eq.(3) may then be written as 1uidtC (4)where C=capacitance, F. Active electrical devices involve the conversion of energy to the elect

23、rical form. For example, the electrical energy in a battery is derived from its stored chemical energy. The electrical energy of a generator is a result of the mechanical energy of the rotating armature conventional慣用的慣用的Active electrical devices有源電器元件有源電器元件battery電池電池chemical energy化學(xué)能化學(xué)能mechanical

24、 energy機(jī)械能機(jī)械能rotating armature旋轉(zhuǎn)的電樞旋轉(zhuǎn)的電樞 A summary of Eqs.(1), Eqs.(2), Eqs.(4) for the three forms of passive circuit elements is given in Fig.1. Note that conventional current flow is used; hence the current in each element is shown in the direction of decreasing voltage. Thus an increment of char

25、ge dq is equal to the current multiplied by the corresponding time increment, or dq=Idt. Eq.(3) may then be written as 1uidtC (4)where C=capacitance, F. 因此電荷增量因此電荷增量dq 等于電流乘以相應(yīng)的時(shí)間增量，等于電流乘以相應(yīng)的時(shí)間增量， 或或dq = i dt， 那么等式那么等式 (1-1A-3) 可寫(xiě)為可寫(xiě)為式中式中 C = 電容量，法拉。電容量，法拉。tiCud1(1-1A-4) Active electrical devices in

26、volve the conversion of energy to the electrical form. For example, the electrical energy in a battery is derived from its stored chemical energy. The electrical energy of a generator is a result of the mechanical energy of the rotating armature conventional慣用的慣用的Active electrical devices有源電器元件有源電器元

27、件battery電池電池chemical energy化學(xué)能化學(xué)能mechanical energy機(jī)械能機(jī)械能rotating armature旋轉(zhuǎn)的電樞旋轉(zhuǎn)的電樞 A summary of Eqs.(1), Eqs.(2), Eqs.(4) for the three forms of passive circuit elements is given in Fig.1. Note that conventional current flow is used; hence the current in each element is shown in the direction of de

28、creasing voltage. Active electrical devices involve the conversion of energy to the electrical form. For example, the electrical energy in a battery is derived from its stored chemical energy. The electrical energy of a generator is a result of the mechanical energy of the rotating armature A summar

29、y of Eqs.(1), Eqs.(2), Eqs.(4) for the three forms of passive circuit elements is given in Fig.1. Note that conventional current flow is used; hence the current in each element is shown in the direction of decreasing voltage. 注意，圖中電流的參考方向?yàn)閼T用的參考方向，因此流注意，圖中電流的參考方向?yàn)閼T用的參考方向，因此流過(guò)每一個(gè)元件的電流與電壓降的方向一致。過(guò)每一個(gè)元件的

30、電流與電壓降的方向一致。 有源電氣元件涉及將其它能量轉(zhuǎn)換為電能，例如，電池中的有源電氣元件涉及將其它能量轉(zhuǎn)換為電能，例如，電池中的電能來(lái)自其儲(chǔ)存的化學(xué)能，發(fā)電機(jī)的電能是旋轉(zhuǎn)電樞機(jī)械能轉(zhuǎn)電能來(lái)自其儲(chǔ)存的化學(xué)能，發(fā)電機(jī)的電能是旋轉(zhuǎn)電樞機(jī)械能轉(zhuǎn)換的結(jié)果。換的結(jié)果。 Active electrical elements occur in two basic forms: voltage sources and current sources. In their ideal form, voltage sources generate a constant voltage independent of

31、the current drawn from the source. The aforementioned battery and generator are regarded as voltage sources since their voltage is essentially constant with load. On the other hand, current sources produce a current whose magnitude is independent of the load connected to the source. Although current

32、 sources are not as familiar in practice, the concept does find wide use in representing an amplifying device, such as the transistor, by means of an equivalent electrical circuit. Symbolic representations of voltage and current sources are shown in Fig.2 occur in存在存在voltage sources電壓源電壓源current sou

33、rces電流源電流源independent of與與.無(wú)關(guān)無(wú)關(guān)aforementioned前面提到前面提到essentially constant 基本不變基本不變not as familiar in practice實(shí)際中不常見(jiàn)實(shí)際中不常見(jiàn)Symbolic representations符號(hào)表示符號(hào)表示 Active electrical elements occur in two basic forms: voltage sources and current sources. In their ideal form, voltage sources generate a constant

34、 voltage independent of the current drawn from the source. The aforementioned battery and generator are regarded as voltage sources since their voltage is essentially constant with load. On the other hand, current sources produce a current whose magnitude is independent of the load connected to the

35、source. Although current sources are not as familiar in practice, the concept does find wide use in representing an amplifying device, such as the transistor, by means of an equivalent electrical circuit. Symbolic representations of voltage and current sources are shown in Fig.2 有源電氣元件存在兩種基本形式：有源電氣元

36、件存在兩種基本形式：電壓源電壓源和和電流源電流源。其理想。其理想狀態(tài)為：電壓源兩端的電壓恒定，與從電壓源中流出的電流無(wú)關(guān)狀態(tài)為：電壓源兩端的電壓恒定，與從電壓源中流出的電流無(wú)關(guān)。因?yàn)樨?fù)載變化時(shí)電壓基本恒定，所以上述電池和發(fā)電機(jī)被認(rèn)為。因?yàn)樨?fù)載變化時(shí)電壓基本恒定，所以上述電池和發(fā)電機(jī)被認(rèn)為是電壓源。另一方面，電流源產(chǎn)生電流，電流的大小與電源連接是電壓源。另一方面，電流源產(chǎn)生電流，電流的大小與電源連接的負(fù)載無(wú)關(guān)。雖然電流源在實(shí)際中不常見(jiàn)，但其概念的確在表示的負(fù)載無(wú)關(guān)。雖然電流源在實(shí)際中不常見(jiàn)，但其概念的確在表示借助于等值電路的放大器件，比如晶體管中具有廣泛應(yīng)用。電壓借助于等值電路的放大器件，比如晶

37、體管中具有廣泛應(yīng)用。電壓源和電流源的符號(hào)表示如圖源和電流源的符號(hào)表示如圖1-1A-2所示。所示。 A common method of analyzing an electrical network is mesh or loop analysis. The fundamental law that is applied in this method is Kirchhoffs first law, which states that the algebraic sum of the voltage around a closed loop is 0, or, in any closed lo

38、op, the sum of the voltage rises must equal the sum of the voltage drops. Mesh analysis consists of assuming that currents-termed loop currents-flow in each loop of a network, algebraically summing the voltage drops around each loop, and setting each sum equal to 0. mesh or loop analysis網(wǎng)孔法或回路分析網(wǎng)孔法或

39、回路分析法法Kirchhoffs first law基爾霍夫第一定律基爾霍夫第一定律algebraic sum代數(shù)和代數(shù)和termed loop currents-所謂的回路電流所謂的回路電流 A common method of analyzing an electrical network is mesh or loop analysis. The fundamental law that is applied in this method is Kirchhoffs first law, which states that the algebraic sum of the voltage

40、 around a closed loop is 0, or, in any closed loop, the sum of the voltage rises must equal the sum of the voltage drops. Mesh analysis consists of assuming that currents-termed loop currents-flow in each loop of a network, algebraically summing the voltage drops around each loop, and setting each s

41、um equal to 0. 分析電網(wǎng)絡(luò)的一般方法是網(wǎng)孔分析法或回路分析法。應(yīng)分析電網(wǎng)絡(luò)的一般方法是網(wǎng)孔分析法或回路分析法。應(yīng)用于此方法的基本定律是基爾霍夫第一定律，基爾霍夫第一用于此方法的基本定律是基爾霍夫第一定律，基爾霍夫第一定律指出：一個(gè)閉合回路中的電壓代數(shù)和為定律指出：一個(gè)閉合回路中的電壓代數(shù)和為0，換句話說(shuō)，換句話說(shuō)，任一閉合回路中的電壓升等于電壓降。網(wǎng)孔分析指的是：假任一閉合回路中的電壓升等于電壓降。網(wǎng)孔分析指的是：假設(shè)有一個(gè)電流設(shè)有一個(gè)電流即所謂的回路電流即所謂的回路電流流過(guò)電路中的每一流過(guò)電路中的每一個(gè)回個(gè)回 路，求每一個(gè)回路電壓降的代數(shù)和，并令其為零。路，求每一個(gè)回路電壓降的

42、代數(shù)和，并令其為零。Consider the circuit shown in Fig.3-a, which consists of an inductor and resistor connected in series to a voltage source e. Assuming a loop current I, the voltage drops summed around the loop are0RLeuu (5) The input voltage is summed negatively, since in the direction of assumed current,

43、it represents an increase in voltage. The drop across each passive element is positive since the current is in the direction of the developed voltage.negatively負(fù)的負(fù)的assumed current假設(shè)電流假設(shè)電流positive正的正的Consider the circuit shown in Fig.3-a, which consists of an inductor and resistor connected in series

44、 to a voltage source e. Assuming a loop current I, the voltage drops summed around the loop are0RLeuu (5) The input voltage is summed negatively, since in the direction of assumed current, it represents an increase in voltage. The drop across each passive element is positive since the current is in

45、the direction of the developed voltage. 考慮圖考慮圖1-1A-3a 所示的電路，其由串聯(lián)到電壓源上的電所示的電路，其由串聯(lián)到電壓源上的電感和電阻組成，假設(shè)回路電流感和電阻組成，假設(shè)回路電流i ，那么回路總的電壓降為，那么回路總的電壓降為 因?yàn)樵诩俣ǖ碾娏鞣较蛏希斎腚妷捍黼妷荷姆较?，所因?yàn)樵诩俣ǖ碾娏鞣较蛏希斎腚妷捍黼妷荷姆较?，所以輸入電壓在（以輸入電壓在?-1A-5）式中為負(fù)。因?yàn)殡娏鞣较蚴请妷合拢┦街袨樨?fù)。因?yàn)殡娏鞣较蚴请妷合陆档姆较颍悦恳粋€(gè)無(wú)源元件的壓降為正。降的方向，所以每一個(gè)無(wú)源元件的壓降為正。 Using the equati

46、ons for the voltage drops in a resistor and inductor, we have diLRiedt (6) Eq.(6) is the differential equation for the current in the circuit. It may be that the inductor voltage rather than the current is the variable of interest in the circuit. As noted in Fig.1, 1Liu dtLSubstituting this integral

47、 for i in Eq.(6) gives LLRuu dteL (7) differential equation微分方程微分方程rather than而不是而不是 Using the equations for the voltage drops in a resistor and inductor, we have diLRiedt (6) Eq.(6) is the differential equation for the current in the circuit. It may be that the inductor voltage rather than the curr

48、ent is the variable of interest in the circuit. As noted in Fig.1, 1Liu dtLSubstituting this integral for i in Eq.(6) gives LLRuu dteL (7) 利用電阻和電感壓降公式，可得利用電阻和電感壓降公式，可得等式等式(1-1A-6)是電路電流的微分方程式。是電路電流的微分方程式。 或許在電路中，人們感興趣的變量是電感電壓而不是電或許在電路中，人們感興趣的變量是電感電壓而不是電感電流。正如圖感電流。正如圖1-1A-1指出的指出的 。用積分代替式。用積分代替式(1-1A-6

49、)中的中的i，可得，可得diLRiedt1Liu dtLLLRuu dteLAfter differentiation with respect to time, Eq.(7) becomes LLduRdeudtLdt (8) which is the differential equation for the inductor voltage.Fig.3-b shows a series circuit containing a resistor, inductor, and capacitor. Following the mesh-analysis method outlined ab

50、ove, the circuit equation is 1diLRiidtedtC(9) After differentiation with respect to time, Eq.(7) becomes LLduRdeudtLdt (8) which is the differential equation for the inductor voltage.Fig.3-b shows a series circuit containing a resistor, inductor, and capacitor. Following the mesh-analysis method out

51、lined above, the circuit equation is 1diLRiidtedtC(9) 在對(duì)時(shí)間微分后，式在對(duì)時(shí)間微分后，式(1-1A-7) 變?yōu)樽優(yōu)?上式是電感電壓的微分方程。上式是電感電壓的微分方程。LLd uRd eud tLd t圖圖1-1A-3b 給出了一個(gè)由電阻、電感和電容組成的串聯(lián)電路，給出了一個(gè)由電阻、電感和電容組成的串聯(lián)電路，根據(jù)上述的網(wǎng)孔分析法，可得電路方程式為根據(jù)上述的網(wǎng)孔分析法，可得電路方程式為Recalling that current i=dq/dt, a substitution of this variable may be made to

52、eliminate the integral from the equation. The result is the second-order differential equation 22d qdqqLRedtdtC (10) 由本文可知電流由本文可知電流 i = dq/dt，用，用dq/dt代替代替i 變量以消除式中變量以消除式中積分，可得二次微分方程為：積分，可得二次微分方程為： 22d qdqqLRedtdtC補(bǔ)充：什么是專業(yè)英語(yǔ)補(bǔ)充：什么是專業(yè)英語(yǔ)普通英語(yǔ)普通英語(yǔ):從小學(xué)、中學(xué)到大學(xué)，詞匯、語(yǔ)法等系從小學(xué)、中學(xué)到大學(xué)，詞匯、語(yǔ)法等系統(tǒng)學(xué)習(xí)統(tǒng)學(xué)習(xí) 科技英語(yǔ)：科技英語(yǔ)：介紹宇宙太空、

53、生物、化學(xué)等，不一定介紹宇宙太空、生物、化學(xué)等，不一定與我們所學(xué)專業(yè)知識(shí)有溝通。有的科技英語(yǔ)帶有科與我們所學(xué)專業(yè)知識(shí)有溝通。有的科技英語(yǔ)帶有科學(xué)普及的性質(zhì)。學(xué)普及的性質(zhì)。專業(yè)英語(yǔ)（專業(yè)英語(yǔ)（English for Special Purpose） 從專業(yè)的實(shí)際出發(fā)，其內(nèi)容緊密結(jié)合專業(yè)內(nèi)容、科從專業(yè)的實(shí)際出發(fā)，其內(nèi)容緊密結(jié)合專業(yè)內(nèi)容、科研人員的實(shí)際工作環(huán)境和實(shí)際需要。其學(xué)習(xí)目的適研人員的實(shí)際工作環(huán)境和實(shí)際需要。其學(xué)習(xí)目的適應(yīng)專業(yè)學(xué)科科學(xué)技術(shù)的發(fā)展需要，培養(yǎng)專業(yè)文獻(xiàn)閱應(yīng)專業(yè)學(xué)科科學(xué)技術(shù)的發(fā)展需要，培養(yǎng)專業(yè)文獻(xiàn)閱讀、翻譯和寫(xiě)作的能力。讀、翻譯和寫(xiě)作的能力。Oral English I seeMe ,

54、tooSee you Why not? How much? Whats new? After you 我明白了。我明白了。我也是。我也是。再見(jiàn)。再見(jiàn)。好呀好呀! (為什么不呢為什么不呢?)多少錢多少錢?有什么新鮮事嗎有什么新鮮事嗎?您先。您先。 Oral English I wish you success.- Thank you.Would you please give us a talk on English Learning?- OK. When?Sorry to have kept you waiting for a long time.- It doesnt matter.Oral

55、 English Poesy THE WINDby C. G. Rossetti(Part I) Who has seen the wind? Neither I nor you; But when the leaves hang trembling, The wind is passing through. 風(fēng)風(fēng) 誰(shuí)曾見(jiàn)過(guò)風(fēng)的面貌？誰(shuí)曾見(jiàn)過(guò)風(fēng)的面貌？ 誰(shuí)也沒(méi)見(jiàn)過(guò)，不論你或我；誰(shuí)也沒(méi)見(jiàn)過(guò)，不論你或我； 但在樹(shù)葉震動(dòng)之際，但在樹(shù)葉震動(dòng)之際， 風(fēng)正從那里吹過(guò)。風(fēng)正從那里吹過(guò)。 Poesy (Part II) Who has seen the wind? Neither you nor I; But

56、 when the trees bow down their heads, The wind is passing by. 誰(shuí)曾見(jiàn)過(guò)風(fēng)的面孔？誰(shuí)曾見(jiàn)過(guò)風(fēng)的面孔？誰(shuí)也沒(méi)見(jiàn)過(guò)，不論你或我；誰(shuí)也沒(méi)見(jiàn)過(guò)，不論你或我； 但在樹(shù)梢低垂之際，但在樹(shù)梢低垂之際， 風(fēng)正從那里經(jīng)過(guò)。風(fēng)正從那里經(jīng)過(guò)。 O wind , why do you never rest, Wandering, whistling to and fro, Bring rain out of the west, From the dim north bringing snow.Poesy 風(fēng)??！為何你永不休止風(fēng)啊！為何你永不休止 來(lái)來(lái)回回的漂

57、泊，呼嘯來(lái)來(lái)回回的漂泊，呼嘯 從西方帶來(lái)了雨從西方帶來(lái)了雨 從蒙眬的北方帶來(lái)了雪。從蒙眬的北方帶來(lái)了雪。 Poesy 作業(yè)作業(yè)1 1：一、請(qǐng)將英文翻譯成中文。一、請(qǐng)將英文翻譯成中文。1 1、part1:unit1:B:part1:unit1:B:第第1 1段翻譯；段翻譯；2 2、part1:unit1:B:part1:unit1:B:第第2 2段翻譯；段翻譯；P1U1B Three-phase Circuits 第一部分第一單元課文第一部分第一單元課文B 三相電路三相電路B 三相電路三相電路1.1.課文內(nèi)容簡(jiǎn)介：主要介紹專業(yè)基礎(chǔ)課課文內(nèi)容簡(jiǎn)介：主要介紹專業(yè)基礎(chǔ)課電路電路中三相電路中三相電路 的

58、概念，采用三相電路的優(yōu)點(diǎn)，三項(xiàng)電路星接和角接電路的概念，采用三相電路的優(yōu)點(diǎn)，三項(xiàng)電路星接和角接電路 中線電壓和相電壓、線電流和相電流之間的關(guān)系。中線電壓和相電壓、線電流和相電流之間的關(guān)系。2.2.溫習(xí)溫習(xí)電路電路中對(duì)稱三相電動(dòng)勢(shì)的產(chǎn)生、星形聯(lián)接和三角中對(duì)稱三相電動(dòng)勢(shì)的產(chǎn)生、星形聯(lián)接和三角 形聯(lián)接、對(duì)稱三相電路的計(jì)算、三相電路的功率等概念。形聯(lián)接、對(duì)稱三相電路的計(jì)算、三相電路的功率等概念。3.3.生詞與短語(yǔ)生詞與短語(yǔ)Pulsate v. 脈動(dòng)，跳動(dòng)，振動(dòng)脈動(dòng)，跳動(dòng)，振動(dòng)apparatus n. 一套儀器，裝置一套儀器，裝置rated adj. 額定的，設(shè)計(jì)的，適用的額定的，設(shè)計(jì)的，適用的coil

59、 n. 繞組，線圈；繞組，線圈；v. 盤繞盤繞distribution n. 分配，分布，配電分配，分布，配電generator n. 發(fā)生器，發(fā)電機(jī)發(fā)生器，發(fā)電機(jī)emf（electromotive force ) 電動(dòng)勢(shì)電動(dòng)勢(shì)interconnect v. 互相連接互相連接 wye n. Y形聯(lián)結(jié)，星形聯(lián)結(jié)，三通形聯(lián)結(jié)，星形聯(lián)結(jié)，三通 delta n. 希臘字母希臘字母 （ ），三角形（物），三角形（物） geometry n. 幾何學(xué)，幾何形狀幾何學(xué)，幾何形狀 winding adj. 纏繞的；纏繞的；n. 線圈，繞組線圈，繞組 polarity n. 極性極性 neutral adj. 中性的；中性的；n. 中性線中性線 subscript n. 下標(biāo)，角注，索引下標(biāo)，角注，索引 succeed v. 繼繼之后，接替之后，接替 intersection n. 相交，邏輯乘法相交，邏輯乘法 phase sequence 相序相序 reverse v., n. 反轉(zhuǎn)；反轉(zhuǎn)；adj. 變換極性的變換極性的 P1U1B Three-phase Circuits 第一部分第一單元課文第一部分第一單元課文B 三相電路三相電路4.4.難句翻譯難句翻譯 1 Viewed in this light, it will be found that the analysis of three-