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title="游記作文">游記作文</a></li> </ul> </nav> </div> </header> <div id="e286xo47mbob" class="con main"> <div id="e286xo47mbob" class="position"> <em class="iconfont ca icon-dingwei"></em> <a href='http://www.yishupeixun.net/'>學習啦</a> > <a href='http://www.yishupeixun.net/zw/'>作文</a> > <a href='http://www.yishupeixun.net/zw/daquan/'>作文大全</a> > <a href='http://www.yishupeixun.net/zw/shuomingwen/'>說明文</a> > <span>科普作文：談?wù)劰舱?/span> </div> <div id="e286xo47mbob" class="ar_con_nr"> <div id="e286xo47mbob" class="con_l fl"> <article class="ar_con bg louti"> <div id="e286xo47mbob" class="ar_title"> <h1>科普作文：談?wù)劰舱?/h1> <div id="e286xo47mbob" class="ar_title_b"> <div id="e286xo47mbob" class="sub_title clear"> <span id="e286xo47mbob" class="sp2 c6 fl">時間：<time class="fxtime">2015-08-28 17:26:46</time></span> <span id="e286xo47mbob" class="sp1 c6 fl"><em id="zuozhe" class="noshow">敏敏</em><em class="user_id noshow">644</em>由 <em class="nickname"></em> 分享</span> <span id="e286xo47mbob" class="fl arc_btn"></span> </div> </div> </div> <div id="e286xo47mbob" class="y_ju"><script type="text/javascript">a("title");</script></div> <div id="e286xo47mbob" class="con_article con_main" id="contentText"> <p>科普作文：談?wù)劰舱?/p><p> 　　摘要：共振對我們的生活、工作是有一定影響的。但是，只要我們動腦筋想辦法共振是容易克服的。</p><p><strong>　　談?wù)劰舱?/strong></p><p> 　　不知道同學們是否知道這樣一件事。大約一百多年前，拿破侖率領(lǐng)法國軍隊入侵西班牙，有一支部隊從鐵鏈懸橋上通過的時候，軍官喊起了口令“一、二、三、四!”隨著這令士兵們跨起了整齊的步伐。當這隊人馬快走到對岸的時，意外的事情發(fā)生了。士兵們只聽轟隆一聲巨響，橋的一跌入河中，橋上的軍官和士兵都被拋進了河里，很多人淹死了。</p><p> 　　這是怎么回事呢?經(jīng)過研究人們才知道這是共振。換句話說就是發(fā)生了振動的重合。</p><p> 　　當一隊人馬邁著整齊的步伐前進的時候，所有的腳都以間隔相等的時間，同時使勁地踏到橋面上。這些周期性的作用力會使橋梁結(jié)構(gòu)受到巨大的振動。由于橋有自己的固有振動頻率，如果行進步伐的周期性作用力的頻率接近或等于橋固有的振動頻率，就會產(chǎn)生共振，這時振動就會越來越強。當它超過設(shè)計規(guī)定的應力時，橋梁就會倒塌了。因此就發(fā)生了上面所說的悲劇。</p><p> 　　相反，如果行進步伐不同，就可以互相抵消一部分振動，這樣就沒有什么危險了。</p><p> 　　所以，世界各國都有這一條相同的規(guī)定：軍隊不能以整齊的步伐過橋。</p><p> 　　象這類事情在生活中也是常見的，比如用扁擔挑水時，開頭幾步還好，多幾步就不行了，桶里的水就會隨著你走路的節(jié)奏，一下一下地從水面中間向外竄，在這時如果你往桶里放一塊木板，挑起來就平穩(wěn)多了。木板起的作用就是破壞共振的。</p><p> 　　共振對我們的生活、工作是有一定影響的。但是，只要我們動腦筋想辦法共振是容易克服的。</p> </div> <div id="e286xo47mbob" class="y_ju"><script type="text/javascript">a("conten");</script></div> <div id="e286xo47mbob" class="pnum"> <ul id="page_slice"> <div id="e286xo47mbob" class="clear"></div> </ul> </div> </article> <div id="e286xo47mbob" class="list_hot ar_related bj_mt20 louti"> <h4 class="title2 title2_te">相關(guān)文章</h4> <ul class="bj_mt20"> <li id="e286xo47mbob" class="lb_3 chao"> <time>05-09</time> <a href="http://www.yishupeixun.net/guanhougan/1684510.html" title="永遠在路上第二集以上率下觀后感作文" target="_blank">永遠在路上第二集以上率下觀后感作文</a> </li> <li id="e286xo47mbob" class="lb_3 chao"> <time>05-09</time> <a href="http://www.yishupeixun.net/guanhougan/1684519.html" title="《永遠在路上》之以上率下觀后感" target="_blank">《永遠在路上》之以上率下觀后感</a> </li> <li id="e286xo47mbob" class="lb_3 chao"> <time>04-24</time> <a href="http://www.yishupeixun.net/guanhougan/1684049.html" title="人心向背永遠在路上觀后感" target="_blank">人心向背永遠在路上觀后感</a> </li> <li id="e286xo47mbob" class="lb_3 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