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href="http://www.cdcfah.com/cp/">產(chǎn)品供應(yīng)</a>?<a href="http://www.cdcfah.com/cp/first-_zmgy/">照明工業(yè)</a>?<a href="http://www.cdcfah.com/cp/second-zmgy_snzmdjeh/">室內(nèi)照明燈具</a>?<a href="http://www.cdcfah.com/cp/third-snzmdjeh_tongdengwa/">筒燈</a>?安徽白光投光燈性能上海先盛照明電器供應(yīng)</p><div id="82dzmtc" class="leftbox clearfix"><h1>安徽白光投光燈性能上海先盛照明電器供應(yīng)</h1><div id="s7x28bx" class="proBig"><div id="shrtlxz" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637269782155068360/7868258.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="crj2ctq" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637269782155068360/7868258.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="kovf3pw" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>安徽白光投光燈性能</p><p><span>***更新：</span>2020-06-20 03:24:20</p><p><span id="click" >瀏覽次數(shù)：1次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="wb7kro3" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海先盛照明電器有限公司</a></p><p><span>聯(lián)系人：</span>顧勇軍</p><p><span>郵箱: </span>522366548@qq.com</p><p><span>電話: </span>13301861712</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span></p><p><span>手機: </span>021-54169416</p><p><span>地址: </span>陶干路1199號</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="k33e28n" class="page-proshow02"><p class="title">詳細說明</p><div id="od7tfxu" class="box"><p><p style="text-indent:25px">光源發(fā)展史因為太陽,才有照明;有了照明,才有光明。光是人類生存與發(fā)展的生命之源，同時光也改變了人類的生活方式。<span style="display:none;"></span><span style="display:none;"></span>據(jù)研究,在人類獲得周圍環(huán)境及生存的外界信息中，有80%是通過光刺激視覺得到的。而人類對照明燈具的使用,要追溯到原始人對篝火的發(fā)現(xiàn)和人類自身對照明的需求。人類照明zui初用的是篝火和火把篝火是在野外架木材、樹枝燃燒的火堆,火把也稱單植枝燭,是指用單根植物枝條點燃來照明,篝火和火把沒有專門的燈具。早在石器時代，人類開始有目的地使用火,用火取暖，安徽白光投光燈性能、烤熟食品，安徽白光投光燈性能，安徽白光投光燈性能,使用松明和人造火把(用動物油脂浸漬木條)作為光源，所謂光源就是能發(fā)光的物體,從而揭開了照明工程的序幕。<span style="display:none;"><span style="display:none;"><span style="display:none;"><span style="display:none;"><span style="display:none;"><span style="display:none;"><span style="display:none;"></span></span></span></span>單根植物枝條點燃來照明,篝火和火把沒有專門的燈<span style="display:none;"></span></span></span></span></p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="安徽白光投光燈性能" src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637269782155068360/7868258.png"></div><p style="text-indent:25px">普通吸頂燈的問題和缺點：含汞汞的沸點很低，在常溫下可蒸發(fā)。一支廢舊丟棄熒光燈破碎后，立即向周圍散發(fā)汞蒸氣，瞬間可使周圍空氣中的汞濃度達到10-20毫克/立方米，超過國家規(guī)定的汞在空氣中比較高允許濃度(為0.01毫克/立方米)的1000至2000倍，人體一次吸入2.5克汞蒸氣即有生命危險。而且液態(tài)汞的滲透率極高，掉到地下以后就會立刻滲入地下污染地下水。1毫克汞足以污染5454.5公斤飲用水，使之達不到安全的飲用標準?，F(xiàn)在拼命推廣節(jié)能燈，實際上也是對我們子孫不負責任的做法。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="安徽白光投光燈性能" src="https://tyunfile.71360.com/WaterMark/UploadFile/shxiansheng/637269781613906250/8543994.png"></div><p style="text-indent:25px">國外照明光源發(fā)展史（1） 15000年前,法國拉斯科Lascaux巖洞，已出現(xiàn)人類diyi盞燈,這種燈是在空心石或貝殼或其他類似物中放入浸滿動物油脂的苔蘚等植物,并用于點燃照明的器具。公元前5000年,人類用油脂多的鳥和魚通過一燈芯點燃照明,在地中海- - 帶,人們用芝麻和堅果等植物油或魚油照明。公元前2000年,巴勒斯坦已出現(xiàn)人造燈。大約在公元前7世紀,希臘人已開始制作赤土陶器燈以替代手執(zhí)火把。人類的照明方式進入了“見光必見燈”的時代后,火焰是weiyi發(fā)出照明光線的來源，但各種火焰光源有如^下缺點:不安全、不可靠、不清潔,以及發(fā)光效率低下、功率太小和發(fā)光不穩(wěn),無法在火焰四周加.上各種.控制光分布的光學(xué)系統(tǒng)從而得到各種配光分布的燈具。到了中世紀,人工照明由簡單的木柴蘸油演進到油燈和蠟燭,大約在蠟燭作為光源的時期出現(xiàn)了專門的燈具。火作為照明光源也在不斷地演變,從火把、松節(jié)油火把、蠟燭發(fā)展到煤油燈。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/321397.html</p></div></div></div></div></div><div id="xrtvsjv" class="page-right twoColRt"><div id="kurtamy" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="x7pdpb2" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強信息推薦自業(yè)物資供應(yīng)" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強信息推薦自業(yè)物資供應(yīng)</p></a></div><div id="l2vx8t8" class="recomPic likePro"><a 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