第7章 好神奇的无线电波
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打消了变卖设备的念头后，刘放接着查看起来，很快的，他就在另一个木头箱子上看到了用红色的墨水写出的一行字：“打倒苏修主义！绝不向苏霸低头！毛主席万岁！！——革命小将朱成功题。”
“我就说军用设备怎么会跑到这里来，原来它们是被红卫兵抢来的，就是不知道这个朱成功是不是当年看护机站的知识青年？看情况应该是吧？”
刘放扫视了几眼，随后退出了机房，外面的天色已经很昏暗了，他需要赶在天彻底黑透之前，把机站漏风的地方给堵住。
这里挨着湖泊，附近几里之内连半个人影都看不到，不管是出于保暖，还是为了抵御恐惧，刘放都觉得自己很有必要这样做。
费了一番功夫，刘放终于堵住了所有的窟窿，他打开房门捡了些相对干燥的枯树枝回来，在屋子中央升起了一堆火。
有了火光的照耀，房间里的黑暗立刻就被驱散，火堆散发出的热量让刘放不再感到寒冷，他伸了个懒腰，又打了个大大的哈欠，没过多久，就靠着床沿睡着了。
也不知道过了多久，刘放被冻醒过来，他睁眼一看，发现火堆已经熄灭，外面漆黑一片，由于身处荒郊野外，刘放不敢出去捡树枝，他缩了缩脖子，把脑袋埋进了双腿中间，企图用自身的温度抵御严寒。
片刻之后，刘放就忍受不住了，天气实在是太冷了，为了取暖，他只得站起身在房间里不停地跺脚，至于他为什么不躲进被窝，那是因为仅有的两床被子全都被泥水给打湿了。
刘德平夫妇扔东西的时候可不会考虑地上的泥水会不会把东西弄湿，在他们的眼中，刘放这个侄儿根本就不值得可怜，谁让这家伙的爸爸、自己的亲哥哥当初那么对待自己呢？
为了节约粮食，刘放每次吃饭都只吃个半饱，此刻他来回走动，自然就加快了食物的消化，没到半个钟头，他就有了饥饿感。
“没有水和柴禾不能做饭，外面黑乎乎的呢……还是等到天亮再说吧。”
刘放透过门板的缝隙瞅了瞅外面，那些隐藏在黑暗中的憧憧黑影，看起来就像是来自地狱的恶魔，最终恐惧战胜了饥饿，让刘放放弃了做饭的念头。
为了抵御饥饿感，刘放决定采用转移注意力的办法，他拿起床底下的书本，点燃了唯一的一盏煤油灯，在灯光下翻阅起来。
“原来收音机接收的就是无线电信号，然后通过解调还原，这才能听到声音的，这也太神奇了吧！”
在昏暗的灯光下，刘放的双眼中迸发出震撼的神色，他怀着强烈的好奇心，继续翻阅起来。
“无线电的本质是电磁波，但只是其中的一个频带，其上限频率为300吉赫兹，下限频率却没有统一的规范……额……吉赫兹是什么啊？”
“电磁方程可以用偏微分方程表达，这种方程又被称为波动方程……电磁方程是什么？偏微分方程又是什么呢？”
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