var json1=({
  "LO": {
    "VOText": {
      "VO": [
        {
          "@id": "sld_sound1",
          "@mp3ref": "p04lfp02a.mp3",
          "#text": "可见光由一组光波组成，这些光波的波长略有不同。"
        },
        {
          "@id": "sld_sound2",
          "@mp3ref": "p04lfp02b.mp3",
          "#text": "眼睛里面的视网膜细胞根据不同的颜色来分辨这些微小的差别。"
        },
        {
          "@id": "sld_sound3",
          "@mp3ref": "p04lfp02c.mp3",
          "#text": "可见光是一组较多的电磁波。它和其它成员一起构成电磁波谱。"
        },
        {
          "@id": "sld_sound4",
          "@mp3ref": "p04lfp02d.mp3",
          "#text": "电磁波谱中的每一组波都有不同的波长范围。"
        },
        {
          "@id": "sld_sound5",
          "@mp3ref": "p04lfp02e.mp3",
          "#text": "电磁波有一些共同的特性。点击图像观看这些特性。"
        },
        {
          "@id": "sld5_sound1",
          "@mp3ref": "p04lfp05a.mp3",
          "#text": "无线电波被用于收音机和电视节目。"
        },
        {
          "@id": "sld5_sound2",
          "@mp3ref": "p04lfp05b.mp3",
          "#text": "无线电波是由传输天线中的交流电产生的，它使电子产生振动。"
        },
        {
          "@id": "sld5_sound3",
          "@mp3ref": "p04lfp05c.mp3",
          "#text": "波频与电流频率是一样的。"
        },
        {
          "@id": "sld5_sound4",
          "@mp3ref": "p04lfp05d.mp3",
          "#text": "波在空气中传播时被天线接收到，并被转换成交流电，与无线电波频率相同。"
        },
        {
          "@id": "sld5_sound5",
          "@mp3ref": "p04lfp05e.mp3",
          "#text": "无线电波既不能被看见也不能被听见。但它们能以一种特殊方式被传送出去，然后被收音机转换成声音，或被电视机转换成图像和声音。"
        },
        {
          "@id": "sld5_sound6",
          "@mp3ref": "p04lfp05f.mp3",
          "#text": "无线电波能在空气和干燥的非金属中传播。但它们被水吸收。"
        }
      ]
    },
    "Labels": {
      "Label": [
        {
          "@id": "slide1_sld_lab1",
          "#text": "长波"
        },
        {
          "@id": "slide1_sld_lab2",
          "#text": "中波"
        },
        {
          "@id": "slide1_sld_lab3",
          "#text": "短波"
        },
        {
          "@id": "slide1_sld_lab4",
          "#text": "特高频 "
        },
        {
          "@id": "slide1_sld_lab5",
          "#text": "超高频 "
        },
        {
          "@id": "slide1_sld_lab6",
          "#text": "微波"
        },
        {
          "@id": "slide1_sld_lab7",
          "#text": "红外线"
        },
        {
          "@id": "slide1_sld_lab8",
          "#text": "紫外线"
        },
        {
          "@id": "slide1_sld_lab9",
          "#text": "X光"
        },
        {
          "@id": "slide1_sld_lab10",
          "#text": "伽马射线"
        },
        {
          "@id": "slide1_sld_lab11",
          "#text": "长的"
        },
        {
          "@id": "slide1_sld_lab12",
          "#text": "1000m"
        },
        {
          "@id": "slide1_sld_lab13",
          "#text": "1m"
        },
        {
          "@id": "slide1_sld_lab14",
          "#text": "1mm"
        },
        {
          "@id": "slide1_sld_lab15",
          "#text": "0.001mm"
        },
        {
          "@id": "slide1_sld_lab16",
          "#text": "波长"
        },
        {
          "@id": "slide1_sld_lab17",
          "#text": "0.000001mm"
        },
        {
          "@id": "slide1_sld_lab18",
          "#text": "0.000000001mm"
        },
        {
          "@id": "slide1_sld_lab19",
          "#text": "很短"
        },
        {
          "@id": "slide1_Act_lab1",
          "#text": "可折射"
        },
        {
          "@id": "slide1_Act_lab2",
          "#text": "横波"
        },
        {
          "@id": "slide1_Act_lab3",
          "#text": "可反射"
        },
        {
          "@id": "slide1_Act_lab4",
          "#text": "可以散开或者在传播途中在障碍物周围进行衍射。"
        },
        {
          "@id": "slide1_Act_lab5",
          "#text": "任何吸收它们的东西都会升温。"
        },
        {
          "@id": "slide1_Act_lab6",
          "#text": "在不同地点之间传递能量。"
        },
        {
          "@id": "slide1_Act_lab7",
          "#text": "以光速传播"
        },
        {
          "@id": "slide5_sld5_lab1",
          "#text": "无线电波"
        },
        {
          "@id": "slide5_sld5_lab2",
          "#text": "波长"
        },
        {
          "@id": "slide5_sld5_lab2_sup1",
          "#text": "-1"
        },
        {
          "@id": "slide5_sld5_lab2_sup2",
          "#text": "4"
        },
        {
          "@id": "slide5_sld5_lab3",
          "#text": "传送器（发射机）"
        },
        {
          "@id": "slide5_sld5_lab4",
          "#text": "收音机天线"
        },
        {
          "@id": "slide5_sld5_lab5",
          "#text": "传输天线"
        },
        {
          "@id": "slide5_sld5_lab6",
          "#text": "扬声器"
        },
        {
          "@id": "slide5_sld5_lab7",
          "#text": "发射台"
        },
        {
          "@id": "slide5_sld5_lab8",
          "#text": "墙"
        },
        {
          "@id": "slide5_sld5_lab9",
          "#text": "天线把能量波转换成电能"
        },
        {
          "@id": "slide5_sld5_lab10",
          "#text": "天线"
        },
        {
          "@id": "slide5_sld5_lab11",
          "#text": "广播1台，波长285米，频率1053千赫。"
        },
        {
          "@id": "slide5_sld5_lab12",
          "#text": "无线电波"
        },
        {
          "@id": "slide5_sld5_lab13",
          "#text": "你知道吗？马可尼是第一个把声音信号传送过大西洋的人，那是在1901年。而且，人不能发觉无线电信号，除非你有无线电接收器。"
        },
        {
          "@id": "slide5_sld5_lab14",
          "#text": "OK"
        },
        {
          "@id": "slide5_sld5_lab15",
          "#text": "点击我可以找到更多的信息！"
        },
        {
          "@id": "slide5_sld5_lab27",
          "#text": "至"
        }
      ]
    }
  }
});
