题干

长沙地铁2号线已开通,据介绍,地铁2号线列车采用的自动保护系统让列车在规定速度内运行,当列车速度超过最高安全速度时,系统会指令列车停下来.为保证停下来时不会追尾和碰撞,如前方有车已停,后方车的自动保护系统就会接收到减速甚至停车的信号.遇紧急刹车时,列车在250米距离内,车速可由80公里/小时降为零.列车客室照明采用节能环保的LED照明方案.照明设备的辅助供电系统安装于列车的车头和车尾,能提供380伏的交流电源.如有紧急情况发生,在电网断电的情况下,蓄电池的紧急照明能提供至少半小时的光亮.另外,每节车厢有两个高清监控摄像头,列车驾驶员可通过驾驶室的监控装置,观察到车内发生的所有情况.文中信息所含物理知识


文中信息

所含物理知识

示例

列车在规定速度内运行

防止惯性现象造成危害

1

节能环保的LED照明方案


2


电磁波传递信息

上一题 下一题 0.0难度 选择题 更新时间:2019-02-07 05:37:32

答案(点此获取答案解析)

【解答】低碳节能的LED,即是发光二极管,制作发光二极管的核心材料就是半导体材料,节省电能;

系统会指令列车停下来,指令是通过电磁波传递信息;

故答案为:节省电能;系统会指令列车停下来.

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    Once when I was facing a decision that involved high risk, I went to a friend. He looked at me for a moment, and then wrote a sentence containing the best advice I've ever had: Be bold and brave — and mighty forces will come to your aid.

    Those words made me see clearly that when I had fallen short in the past, it was seldom because I had tried and failed. It was usually because I had let fear of failure stop me from trying at all. On the other hand, whenever I had plunged into deep water, forced by courage or circumstance, I had always been able to swim until I got my feet on the ground again.

    Boldness means a decision to bite off more than you can eat. And there is nothing mysterious about the mighty forces. They are potential powers we possess: energy, skill, sound judgment, creative ideas — even physical strength greater than most of us realize.

    Admittedly, those mighty forces are spiritual ones. But they are more important than physical ones. A college classmate of mine, Tim, was an excellent football player, even though he weighed much less than the average player. “In one game I suddenly found myself confronting a huge player, who had nothing but me between him and our goal line,” said Tim. “I was so frightened that I closed my eyes and desperately threw myself at that guy like a bullet — and stopped him cold.”

    Boldness — a willingness to extend yourself to the extreme—is not one that can be acquired overnight. But it can be taught to children and developed in adults. Confidence builds up. Surely, there will be setbacks (挫折) and disappointments in life; boldness in itself is no guarantee of success. But the person who tries to do something and fails is a lot better off than the person who tries to do nothing and succeeds.

    So, always try to live a little bit beyond your abilities—and you'll find your abilities are greater than you ever dreamed.