3, Control systems frequently employ components of manytypes.译：控制系统经常要用到很多类型的元件。4、 Automatic control systems are physical systems whichhave dynamic behavior.译：自动控制系统是具有动态特性的物理系统
3、Control systems frequently employ components of many types. 译：控制系统经常要用到很多类型的元件。 4、Automatic control systems are physical systems which have dynamic behavior. 译：自动控制系统是具有动态特性的物理系统
5, Continuous control readily lends itself to an understandingof feedback control theory using relatively uncomplicatedmathematics.译文：由于使用的数学相对简单，故连续控制的反馈控制理论更容易理解。6 Digital computers are finding extensive application inindustrial process control systems.译文：数字计算机在工业过程控制系统中获得了广泛的应用
6 、 Digital computers are finding extensive application in industrial process control systems. 译文：数字计算机在工业过程控制系统中获得了广泛的应用。 5、Continuous control readily lends itself to an understanding of feedback control theory using relatively uncomplicated mathematics. 译文：由于使用的数学相对简单，故连续控制的反馈控制理论更 容易理解
P1U1AElectricalNetworks1. An electrical circuit or network is composed ofelements such as resistors, inductors, and capacitorsconnected together in some manner.译：电路或电网是由以某种方式连接的电阻、电感和电容等元件组成的
1. An electrical circuit or network is composed of elements such as resistors, inductors, and capacitors connected together in some manner. 译：电路或电网是由以某种方式连接的电阻、电感和电 容等元件组成的。 P1U1A Electrical Networks
2. If the network contains no energy sources, such asbatteries or electrical generators, it is known as apassivenetwork译：如果网络不包含能源，如电池或发电机，那么就被称作无源网络。3. On the other hand, if one or more energy sources arepresent, the resultant combination is an active network译：换句话说，如果存在一个或多个能源，那么组合的结果为有源网络
2. If the network contains no energy sources, such as batteries or electrical generators, it is known as a passive network. 译：如果网络不包含能源，如电池或发电机，那么就被 称作无源网络。 3. On the other hand, if one or more energy sources are present, the resultant combination is an active network. 译：换句话说，如果存在一个或多个能源，那么组合的 结果为有源网络
4. In studying the behavior of an electrical network, we areinterested in determining the voltages and currents that existwithinthecircuit译：在研究电网络的特性时，我们感兴趣的是确定电路中的电压和电流。5. Since a network is composed of passive circuit elements,we must first define the electrical characteristics of theseelements.译：由于网络由无源电路元件组成，所以必须首先定义这些元件的电气特性
4. In studying the behavior of an electrical network, we are interested in determining the voltages and currents that exist within the circuit. 译：在研究电网络的特性时，我们感兴趣的是确定电路中的电 压和电流。 5. Since a network is composed of passive circuit elements, we must first define the electrical characteristics of these elements. 译：由于网络由无源电路元件组成，所以必须首先定义这些元 件的电气特性