题目

阅读理解Safe Travel Abroad Preparing to go traveling abroad can bereally stressful, especially if you don't know what to expect. Here is a listof important things to remember, so you know exactly what you need to do beforeyou take off. What vaccines(疫苗)do I need? Go to your doctor for advice as soon as youknow you're going traveling. He will know what vaccines you will need and willbe able to advise you on when you need to have them. Remember some vaccinesneed to be given months ahead, so make sure you book an appointment as early aspossible. Do I need a visa(签证)? It's important th如图所示，某大型宾馆设有地下停车场，地下值班室的工作人员可以通过操纵室内的开关，使想存车的司机通过看入口处的红、绿灯便可知车场内是否有空车位：红灯亮，无车位；绿灯亮，有车位．请你设计出满足上述要求的电路(电源用电池组)．