1、单词：20分，10个二。句子翻译：40分，8题1:P2A common method of analyzing an electrical network is mesh or loop analysis. The fundamental law that is applied in this method is Kirchhoff's first law, which states that the algebraic sun of the voltages around a closed loop is 0 ,or , in any closed loop , the sum of th
2、e 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.分析电网络的一般方法是网孔分析法或回路分析法。应用于此方法的基本定律是基尔霍夫第一定律，基尔霍夫第一
3、定律指出：一个闭合回路中的电压代数和为0，换句话说，任一闭合回路中的电压升等于电压降。网孔分析指的是：假设有一个电流——即所谓的回路电流——流过电路中的每一个回路，求每一个回路电压降的代数和，并令其为零。2:P17Alternatively, suppose that there had been attached to each pilot’s seat an electronic device that provided an output voltage which is V1 when the seat is occupied and V2 when the seat is not
4、occupied. Let us attach the designation “true” to the voltage level V2 so that the level V1 is “false”. Let us further construct an electric circuit with two sets of input terminals and one set of output terminals. The circuit is to have the property that the output voltage will be V2 if and only
5、if both inputs, i.e., one input AND simultaneously the other, are at the level V2. Otherwise the output is V1Finally let us connect the inputs to the devices on the chairs of pilots A and B and arrange that an alarm bell, connected to the output Z, respond when the output is V2 (“true”) and not oth
6、erwise. We have then constructed a circuit which performs the AND operation and is capable of making the logical deduction that the plane is unpiloted when, indeed, both pilots leave the cockpit换句话说，假设每一位飞行员座位下面有一个电子装置，当座位上有人时，其输出电压为V1，当座位上无人时，其输出电压为V2。现在我们用“真”来代表电压V2，从而使电压V1表示“假”。让我们进一步制作一个带有两个输入端
7、和一个输出端的电路，此电路的特性是：只要两个输入，即一个输入同时和另一个输入相与，结果为V2时，输出电压才是V2。否则，输出是V1。最后，让我们把输入和飞行员A和B座位下的装置联结起来，并安装一个与输出Z相连的警铃，当输出是V2(“真”)时响应，否则不响应。这样，我们已创建了一个执行与操作的电路，这个电路能完成当两个驾驶员确实都离开驾驶舱时飞机是无人驾驶的逻辑推断。3:P66Control theory it
