var json1=({
  "LO": {
    "VOText": {
      "VO": [
        {
          "@id": "sld5_sound1",
          "@mp3ref": "p04lfp05a.mp3",
          "#text": "无线电波用于传送广播和电视节目。"
        },
        {
          "@id": "sld5_sound2",
          "@mp3ref": "p04lfp05b.mp3",
          "#text": "发射天线中的电流发生变化，使电子发生振动，从而可产生无线电波。"
        },
        {
          "@id": "sld5_sound3",
          "@mp3ref": "p04lfp05c.mp3",
          "#text": "电波的频率与电流的频率相同。"
        },
        {
          "@id": "sld5_sound4",
          "@mp3ref": "p04lfp05d.mp3",
          "#text": "无线电波在空气中传播并被接收天线接收，然后接收天线将其转换成频率相同的交流电。"
        },
        {
          "@id": "sld5_sound5",
          "@mp3ref": "p04lfp05e.mp3",
          "#text": "无线电波是看不见、听不到的。但是，他们能够以特殊模式发送出去，然后被收音机转换成声音，或者被电视转换成图像和声音。"
        },
        {
          "@id": "sld5_sound6",
          "@mp3ref": "p04lfp05f.mp3",
          "#text": "无线电波能够在空气和干燥的非金属物质中传播，但会被水吸收。"
        },
        {
          "@id": "sld6_sound1",
          "@mp3ref": "p04lfp06a.mp3",
          "#text": "载有不同无线电台的信号的无线电波有着不同的频率和波长。"
        },
        {
          "@id": "sld6_sound2",
          "@mp3ref": "p04lfp06b.mp3",
          "#text": "长、中波无线电传输能够通过大气层上部的带电粒子层——“电离层”进行反射。"
        },
        {
          "@id": "sld6_sound3",
          "@mp3ref": "p04lfp06c.mp3",
          "#text": "这使得它们能够跨越地球弯曲的表面传输很远的距离。"
        },
        {
          "@id": "sld6_sound4",
          "@mp3ref": "p04lfp06d.mp3",
          "#text": "长、中波会在丘陵地域发生衍射，这样，即使在山谷中，您的收音机也能接收到电波。"
        },
        {
          "@id": "sld6_sound5",
          "@mp3ref": "p04lfp06e.mp3",
          "#text": "VHF（甚高频）电波用于高品质的立体声电台。"
        },
        {
          "@id": "sld6_sound6",
          "@mp3ref": "p04lfp06f.mp3",
          "#text": "UHF（特高频）电波用于电视信号的传输。"
        },
        {
          "@id": "sld6_sound7",
          "@mp3ref": "p04lfp06g.mp3",
          "#text": "UHF（特高频）电波的传输需要发射器与收音机或电视天线之间有一条笔直的路径，否则接收效果不佳。因为它们在丘陵区域不会产生明显的衍射。"
        }
      ]
    },
    "Labels": {
      "Label": [
        {
          "@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": "发射器"
        },
        {
          "@id": "slide5_sld5_lab4",
          "#text": "无线电天线"
        },
        {
          "@id": "slide5_sld5_lab5",
          "#text": "发射天线"
        },
        {
          "@id": "slide5_sld5_lab6",
          "#text": "扬声器"
        },
        {
          "@id": "slide5_sld5_lab7",
          "#text": "发射器"
        },
        {
          "@id": "slide5_sld5_lab8",
          "#text": "墙壁"
        },
        {
          "@id": "slide5_sld5_lab9",
          "#text": "天线将能量波动转换成电能。"
        },
        {
          "@id": "slide5_sld5_lab10",
          "#text": "天线"
        },
        {
          "@id": "slide5_sld5_lab11",
          "#text": "1 号电台使用的无线电波波长为 285 米，频率为 1053 千赫。"
        },
        {
          "@id": "slide5_sld5_lab12",
          "#text": "无线电波"
        },
        {
          "@id": "slide5_sld5_lab22",
          "#text": "至"
        },
        {
          "@id": "slide5_instruct",
          "#text": "单击这里了解更多信息！"
        },
        {
          "@id": "slide5_didtitle",
          "#text": "您知道吗？"
        },
        {
          "@id": "slide5_oktext",
          "#text": "确定"
        },
        {
          "@id": "slide5_didtext",
          "#text": "马可尼于 1901 年首次实现了音频信号的跨大西洋传输。此外，人体无法感知无线电波，除非您有一台无线电接收器。"
        },
        {
          "@id": "slide6_sld6_lab1",
          "#text": "中波.........3.33  3.17  3.0  2.83....................MHz"
        },
        {
          "@id": "slide6_sld6_lab2",
          "#text": "长波....85    90    95  100  105.....................MHz"
        },
        {
          "@id": "slide6_sld6_lab3",
          "#text": "1 号电台使用的无线电波波长为 285 米，频率为 1053 千赫。"
        },
        {
          "@id": "slide6_sld6_lab4",
          "#text": "苏格兰电台使用的无线电波波长为 370 米，频率为 810 千赫。"
        },
        {
          "@id": "slide6_sld6_lab5",
          "#text": "发射器"
        },
        {
          "@id": "slide6_sld6_lab6",
          "#text": "大气层上部（电离层）"
        },
        {
          "@id": "slide6_sld6_lab7",
          "#text": "天线"
        },
        {
          "@id": "slide6_sld6_lab8",
          "#text": "长、中波"
        },
        {
          "@id": "slide6_instruct",
          "#text": "单击这里了解更多信息！"
        },
        {
          "@id": "slide6_didtitle",
          "#text": "您知道吗？"
        },
        {
          "@id": "slide6_oktext",
          "#text": "确定"
        },
        {
          "@id": "slide6_didtext",
          "#text": "天文学家使用射电望远镜来检测遥远星系中的星体所产生的无线电波。英格兰的卓瑞尔河岸天文台有一台射电望远镜。"
        },
        {
          "@id": "slide6_sld_lab1",
          "#text": "长波"
        },
        {
          "@id": "slide6_sld_lab2",
          "#text": "中波"
        },
        {
          "@id": "slide6_sld_lab3",
          "#text": "短波"
        },
        {
          "@id": "slide6_sld_lab4",
          "#text": "VHF（甚高频）"
        },
        {
          "@id": "slide6_sld_lab5",
          "#text": "UHF（特高频）"
        },
        {
          "@id": "slide6_sld_lab6",
          "#text": "微波"
        },
        {
          "@id": "slide6_sld_lab7",
          "#text": "红外线"
        },
        {
          "@id": "slide6_sld_lab8",
          "#text": "紫外线"
        },
        {
          "@id": "slide6_sld_lab9",
          "#text": "X 射线"
        },
        {
          "@id": "slide6_sld_lab10",
          "#text": "伽马射线"
        },
        {
          "@id": "slide6_sld_lab11",
          "#text": "长"
        },
        {
          "@id": "slide6_sld_lab12",
          "#text": "1000 米"
        },
        {
          "@id": "slide6_sld_lab13",
          "#text": "1 米"
        },
        {
          "@id": "slide6_sld_lab14",
          "#text": "1 毫米"
        },
        {
          "@id": "slide6_sld_lab15",
          "#text": "0.001 毫米"
        },
        {
          "@id": "slide6_sld_lab16",
          "#text": "波长"
        },
        {
          "@id": "slide6_sld_lab17",
          "#text": "0.000001 毫米"
        },
        {
          "@id": "slide6_sld_lab18",
          "#text": "0.000000001 毫米"
        },
        {
          "@id": "slide6_sld_lab19",
          "#text": "很短"
        }
      ]
    }
  }
});
