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近年来,随着教育改革的逐步深入,命题者从培养学生的创造性思维能力和应用能力出发,编拟了一类新题型——设计题。 例1 图1是一个灯箱,上面装有两个小灯泡L_1、L_2和两个开关S_1、S_2,盒内已用导线将上述元件和两节干电池连成电路。闭合开关S_1、S_2时,两灯同时发光;断开S_1时,两灯都不发光;闭合S_1、断开S_2时,L_1发光,L_2不发光。请你在方框中画出灯箱内器材连接的电路图。 (1999,贵州市中考题)
In recent years, with the gradual deepening of education reforms, propositions from the cultivation of students’ creative thinking ability and application ability, prepared a new type of questions - design questions. Example 1 Fig. 1 shows a light box with two small light bulbs L_1, L_2 and two switches S_1, S_2 mounted thereon, and the elements and two dry batteries have been wired into circuits within the box. When the switches S_1 and S_2 are closed, the two lamps emit light at the same time; when the S_1 is turned off, both lamps do not emit light; when the S_1 is closed, and the S_2 is disconnected, the L_1 emits light and the L_2 does not emit light. Please draw the circuit diagram of the device connection in the light box in the box. (1999, Guizhou Examination Questions)