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各地物理中考试题进行了较大的改革,出现了许多新的变化,涌现出很多联系实际,贴近生活、新颖活泼,具有开放性创造性的新题型,充分体现了初中物理新课程标准的理念.例1在两条道路的交叉口安装红绿灯指挥车辆,可保障行车安全,如图1甲,当AB方向绿灯L_2亮时,CD方向红灯亮L_4同时亮;当AB方向红灯L_1亮时,CD方向绿灯L_3同时亮,请同学按上述要求在图1乙中的虚线框内画出L_1、L_2、L_3、L_4连接图;完成一个“红绿灯”的模拟电路,(图1甲中S是一个单
There are many new changes in examination questions in physics all over the country. Many new kinds of questions have emerged in the physics examinations. Many new types of questions have come into contact with reality, being close to life, being novel and lively, and being open and creative. They have fully embodied the concept of the new middle school physics curriculum standard. Example 1 Traffic lights are installed at the intersections of two roads to ensure traffic safety. As shown in Figure 1, when the green light L_2 in the AB direction is on, the red light L_4 in the CD direction is on at the same time; when the red light L_1 in the AB direction is on, CD direction of the green light L_3 at the same time, students in accordance with the above requirements in Figure 1 B in the dashed box drawn L_1, L_2, L_3, L_4 connection diagram; completed a “traffic light” analog circuit Is a single