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alt="科學(xué)小論文獲獎(jiǎng)?wù)撐?/></p><h2>　　篇一：轉(zhuǎn)地高手——蚯蚓</h2><p>　　在前幾天，我在草地上看見(jiàn)一條條細(xì)細(xì)的，像是土條。我一邊感到好奇一邊在想：它們是什么奇妙的動(dòng)物變成的呢？我小心地把土翻開(kāi)，發(fā)現(xiàn)是條蚯蚓。</p><p>　　我仔細(xì)一看，這條蚯蚓的口長(zhǎng)在哪里呢？它的環(huán)帶像一條紅圍巾，根本分不清哪個(gè)是口哪個(gè)是肛門(mén)。我借用科學(xué)課上所學(xué)的知識(shí)思考，離環(huán)帶近一點(diǎn)的是口而不是肛門(mén)。我問(wèn)了一下老師和同學(xué)，原來(lái)它還喜歡吃枯葉��！</p><p>　　我看著蚯蚓沒(méi)有腳，發(fā)現(xiàn)它靠身體伸縮爬行。它縮的時(shí)候，像只剩下一點(diǎn)點(diǎn)的大大卷。它伸長(zhǎng)的時(shí)候，像一條直直的小蛇。一伸一縮，一伸一縮。</p><p>　　這一條蚯蚓它爬了半天，只爬了那么一點(diǎn)點(diǎn)距離，我覺(jué)得它應(yīng)該和蝸牛賽跑了！我猜想應(yīng)該是蚯蚓先到的終點(diǎn)吧！因?yàn)樗纳碜娱L(zhǎng)一些，到終點(diǎn)的時(shí)候更容易碰到終點(diǎn)線一些！</p><p>　　我想把它抓回去的，但又在想，它也是媽媽的寶貝，如果它媽媽找不到它，肯定會(huì)很著急的呢！</p><h2>　　篇二：雄龜小雌龜大</h2><p>　　這個(gè)星期六，阿姨從錢(qián)江市場(chǎng)買(mǎi)回了兩只烏龜，一只大，一只小。阿姨告訴我，大的是雌龜，小的是雄龜。我和弟弟趴在玻璃缸上，仔細(xì)觀察這兩只烏龜。</p><p>　　兩只烏龜長(zhǎng)得可像啊，背上駝著個(gè)橢圓形的大盔甲�！翱住敝虚g高，兩邊低，像個(gè)小山包。上面有十三塊近似菱形的格子，最中央的三塊比較大，排列也比較整齊，其余的十塊均勻地分布在四周。</p><p>　　兩只烏龜長(zhǎng)著像蛇頭一樣的小腦袋。小腦袋大約占了身體全長(zhǎng)的六分之一，兩只圓溜溜的“黑豆”似的小眼睛長(zhǎng)在腦袋的兩側(cè)，一眨一眨的，特別機(jī)靈；正前方是嘴，嘴上方是兩個(gè)針孔大小的鼻孔。</p><p><strong>　　產(chǎn)生疑問(wèn)：小的是雄龜還是雌龜？</strong></p><p>　　“看看非常像，比一比不一樣�！蔽野l(fā)現(xiàn)兩只烏龜背部的顏色不一樣。大的烏龜，顏色是黑褐色的，小的烏龜是棕黃色的。咦？我忽然記起，一次在書(shū)上看到，可以根據(jù)烏龜背部的顏色來(lái)分辨哪只是雄的，哪只是雌的。我清楚地記得，顏色黑褐色的才是雄的，顏色棕黃色的是雌的。難道阿姨說(shuō)的這只小的烏龜是雌的，大的才是雄的`？難道它們不同歲嗎？如果不同歲，那我們就不能簡(jiǎn)單地根據(jù)它們的大小來(lái)辨別哪只是雄龜，哪只是雌龜了？我的心中出現(xiàn)了一連串的問(wèn)號(hào)……</p><p><strong>　　查閱資料：辨別雄龜和雌龜?shù)姆椒?/strong></p><p>　　我馬上把自己的疑惑告訴阿姨，阿姨聽(tīng)我這么一說(shuō)，也覺(jué)得有道理。到底兩只烏龜是不是同歲，我們無(wú)法找到確切的答案。既然不能確定是不是同齡龜，我們就不能肯定地說(shuō)，個(gè)兒小的是雄龜，個(gè)兒大的是雌龜。對(duì)，查查資料。我和阿姨一起上網(wǎng)查找了有關(guān)辨別雄龜和雌龜?shù)姆椒�，結(jié)果正如我想的那樣，如果根據(jù)顏色來(lái)辨別，那只大的是雄龜，小的才是雌龜。為了進(jìn)一步證實(shí)我們的判斷是正確的，我們又對(duì)照了另外幾種辨別雄龜和雌龜?shù)姆椒�，如雄龜�(shù)奈脖?xì)、尾長(zhǎng)，雌龜?shù)奈脖�、尾短，雄龜有特殊的臭味，雌龜無(wú)異味等等。又如雄龜?shù)母辜茁詾榘枷�，正好可以卡住雌龜突起的背殼；但是雌龜就不需要這種構(gòu)造，因此腹甲是平的。所以只要把烏龜翻過(guò)身來(lái)，用手指觸摸腹甲的幅度，就能很快分辨出雌雄了。我根據(jù)搜集的資料，制作了一張雄龜和雌龜?shù)膶?duì)比表。</p><p><strong>　　真相大白：小的是雌龜大的是雄龜</strong></p><p>　　我們一邊觀察，一邊把這些辨別的方法進(jìn)行一一比較，得出結(jié)論：果然不出我所料，這只小的是雌龜，大的才是雄龜。原來(lái)這兩只烏龜不是同齡龜，所以我們不能根據(jù)它的體形大小來(lái)分辨雌雄。因?yàn)橹挥袑?duì)于同年的成年龜，我們才可以根據(jù)它們的體形大小來(lái)辨別：雄龜體形較薄而�。淮讫旙w形圓厚且大。</p><h2>　　篇三：皮鞋為什么越擦越亮</h2><p>　　星期天，看見(jiàn)爸爸那雙滿是灰塵的皮鞋忍不住嘆氣‘‘唉，看來(lái)又是我做‘苦力的時(shí)間了’我拿起爸爸那雙滿是灰塵的皮鞋涂上鞋油仔細(xì)的擦了一遍皮鞋又重現(xiàn)‘青春’這是為什么呢？我不經(jīng)疑惑。</p><p>　　于是我找到另一雙新鞋和舊鞋進(jìn)行比對(duì)我先用手觸摸兩雙皮鞋的鞋面發(fā)現(xiàn)新皮鞋比舊皮鞋的表面要光滑。舊皮鞋涂上鞋油后，仔細(xì)觀察，雖然亮了很多但仍無(wú)法跟新皮鞋比。皮鞋亮度是否與皮鞋光滑度有關(guān)？</p><p>　　我去取一雙舊皮鞋，在放大鏡下皮鞋顯得凹凸不平。然后我再皮鞋都比較粗糙的1區(qū)和2區(qū)涂上鞋油仔細(xì)擦拭，2區(qū)不涂做空白對(duì)照。我發(fā)現(xiàn)1區(qū)擦拭后，表面明顯光滑很多，放在用陽(yáng)光下也比2區(qū)有光澤為什么兩者有這樣的差別呢？</p><p>　　于是我就去問(wèn)爸爸得知：皮鞋表面原本就不是絕對(duì)光滑的，如果是舊皮鞋就更加不平了這樣它就不能使光線在一定方向上產(chǎn)生反射，看上去沒(méi)什么光澤。但鞋油中的一些小顆粒正好填補(bǔ)在皮鞋的凹坑中，如果用布擦一擦，讓鞋油涂的更平均，就使皮鞋表面更光滑，平整光線反射更強(qiáng)。</p><p>　　通過(guò)實(shí)驗(yàn)，我終于知道了皮鞋越擦越亮得秘密了。</p><h2>　　篇四：毛球修剪器</h2><p>　　你家是不是有毛衣？我想，你一定說(shuō)有的�，F(xiàn)在的每家每戶都有毛衣，可是你是否觀察過(guò)毛衣呢？仔細(xì)觀察，你就會(huì)發(fā)現(xiàn)毛衣上有許多的小圓球，由毛衣上的毛組成。這樣不僅妨礙美觀，還會(huì)讓你摸起來(lái)非常不舒服。如果處理不當(dāng)，會(huì)損壞整個(gè)毛衣，反而更不好。這個(gè)時(shí)候就輪到毛球修剪器上場(chǎng)了。只見(jiàn)它開(kāi)足馬力，對(duì)著毛球一刮，就看見(jiàn)毛球全部都不翼而飛，毛衣干干凈凈。正在我對(duì)這個(gè)毛球修剪器贊嘆不已時(shí)，突然升起一團(tuán)疑云，毛球修剪器到底是怎樣修剪的呢？</p><p>　　我正疑惑的時(shí)候，爸爸發(fā)話了，讓我自己去尋找答案。</p><p>　　我拿出說(shuō)明書(shū)，仔細(xì)的研究了一下，便開(kāi)始拆修剪器。我先把修理器的開(kāi)關(guān)關(guān)閉，再把最外層的外刀網(wǎng)旋開(kāi)，拔出來(lái)，然后再把最主要的圓刀拿出來(lái)，上面有著極其鋒利的刀片，再往下就看見(jiàn)了風(fēng)葉，上面有著四塊豎起來(lái)的板，打開(kāi)開(kāi)關(guān)就會(huì)飛快的轉(zhuǎn)動(dòng)，在風(fēng)葉的最下面，還有著一個(gè)巨大的缺口，毛球就是從這里掉下去，掉進(jìn)儲(chǔ)物倉(cāng)，保存在里面。</p><p>　　原來(lái)，這個(gè)修剪器，由一個(gè)馬達(dá)轉(zhuǎn)動(dòng)風(fēng)葉，風(fēng)葉連接著圓刀，風(fēng)葉一高速轉(zhuǎn)動(dòng)，圓刀也高速轉(zhuǎn)動(dòng)。外面的外刀網(wǎng)隔開(kāi)了衣服和圓刀，防止直接接觸衣物造成的破損。外刀網(wǎng)上有許多小孔，在接觸衣物時(shí)讓毛球伸進(jìn)外刀網(wǎng)，被圓刀直接割斷。被割斷的毛球從圓刀的旁邊掉入下面的風(fēng)葉上。風(fēng)葉上的四塊豎起的板子在高速轉(zhuǎn)動(dòng)的情況下，像打羽毛球一樣，把毛球“打”進(jìn)儲(chǔ)物倉(cāng)。在實(shí)驗(yàn)的過(guò)程中，我發(fā)現(xiàn)了一個(gè)問(wèn)題：我一把外刀網(wǎng)旋下來(lái)，這個(gè)修理器就不再轉(zhuǎn)動(dòng)。難道是沒(méi)電了？那為什么剛才還轉(zhuǎn)的這么快？經(jīng)過(guò)我多次試驗(yàn)，發(fā)現(xiàn)風(fēng)葉旁有一個(gè)按鈕，就像冰箱上的燈一樣，有個(gè)下壓按鈕。外刀網(wǎng)旋緊后，會(huì)把這個(gè)按鈕往下壓，壓到最底部時(shí)，保護(hù)功能就會(huì)關(guān)閉，修剪器就會(huì)正常工作。</p><p>　　原來(lái)一個(gè)毛球修剪器還有這么大的學(xué)問(wèn)啊！</p> 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