In order to reduce the skin friction efficiently,more research works should be done on the characteristics of turbulent boundary layer,turbulent coherent structures and the mechanism of turbulent drag reduction for flow over riblets surfaces.

為更有效地減少表面摩阻日韩情侣中文自拍视频网站，必須深入開展對溝槽面湍流邊界層特性欧美性爱丫丫丫、湍流擬序結(jié)構(gòu)及湍流減阻機(jī)理等方面的研究一级做a爱片久久毛片看看精品。

The experimental results indicated that,under the windward and leeward conditions,the cooling effect of crushed rock revetments with all these four grain-diameters was good and could effectively reduce the temperatures of the underlying soil layers;furthermore,the mean pe.

結(jié)果表明：迎風(fēng)與背風(fēng)兩種條件下天天操天天狠天天透，4種粒徑塊精品久久国产精品99国产、碎石護(hù)坡均具有較好的降溫效果绿巨人直播在线观看免费，均可在第2個(gè)試驗(yàn)周期將其下部土坡表面平均溫度迅速降至0℃以下，有效地對其下部土體進(jìn)行降溫国产在线一区无码视频久。

The paper describes in detail the four factors resulting in the corrosion of buried steel pipeline,that is environment,corrosion control effectiveness,material of pipe steel,and stress of pipeline,presents a total statistics on petroleum asphalt,coal-tar enemal,extruded polyethylene coating,PE tape,FBE,and multiple coating system and the individual percentage of theirs per years during 1990-1995,and points out that the selection of all kinds of coatings,being different behaviors,should be defermined according to the geological conditions and corrosive environments along pipeline route.

闡述了埋地鋼質(zhì)管道發(fā)生腐蝕的四個(gè)影響因素免费网站一区二区，即環(huán)境、腐蝕防護(hù)效果亚洲国产精品三区第一次、鋼管材質(zhì)和制造工藝以及應(yīng)力水平免费人成视频在线观看完整版，統(tǒng)計(jì)了1990-1995年石油瀝青、煤焦油瓷漆国产精品视频拍自网站、擠塑聚乙烯国产精品第99页在线观看看、PE膠帶、FBE影音先锋日韩在线资源、復(fù)合覆蓋層的涂敷量中文在线天堂网www官网，指出防腐覆蓋層各有優(yōu)缺點(diǎn)，應(yīng)根據(jù)管道線路的地質(zhì)條件中文字幕日本黄色视频、腐蝕環(huán)境等而定加勒比在线精品观看，目前應(yīng)建立防腐層的綜合評價(jià)方法以解決防腐覆蓋層的設(shè)計(jì)問題，同時(shí)還應(yīng)對鋼管表面處理欧美激情a片免费专区、現(xiàn)場補(bǔ)口加以重視6080无码吃奶在线观看视频，在采用高強(qiáng)薄壁鋼材時(shí)應(yīng)考慮壁厚要求。

The native grasses and weeds, the scattered patches of gores, contended with one another for the possession of the scanty surface soil; they fought against the droughts of summer,the frosts of winter, and the furious gales which swept with unbroken force, now from the Atlantic,and now from the North Sea, at all times of the year; they filled up, as they might, the gaps made in their ranks by all sorts of underground animal ravagers.

本地的牧草和雜草91超碰在线中出，分散在一小塊一小塊土地上的金雀花超碰在线免费公开干，為了占據(jù)貧乏的表面土壤而互相競爭著：它們同夏天的干旱斗爭，同冬季的嚴(yán)霜斗爭月综合网，同一年四季時(shí)而從大西洋時(shí)而從北海不斷吹來的狂風(fēng)斗爭无码网站色哟哟在线观看；它們竭盡全力來填補(bǔ)各種地面上和地下的動物破壞者在它們行列中間所造成的孔隙。

The rest are merely mouthing words, and all their ornaments and bodily decorations, their pujas and ringing of bells - all that is just superstition without any significance.

什么是宗教？其他的人只是滔滔不絕地說說而已美女张开腿被弄到高潮视频，所有表面的裝飾品一极黄色网站、祭供和搖鈴等，都不過是毫無意義的迷信黄色毛片免费看永久。

Nevertheless, in this gure the horizontal axis of the resultant proles are converted to surface positions varying from zero to expected feeds of 0.4, 0.6, 0.8 and 1.0 mm/rev for better comprehension.

然而www黄色网站免费观看com，在這個(gè)數(shù)字橫軸的由此造成的個(gè)人資料將被轉(zhuǎn)換為表面的立場不同從零到預(yù)期飼料0.4 ， 0.6 91后入国产在线， 0.8和1.0毫米/恢復(fù)為更好地理解可以在线观看毛片的网站。

This surface consists of a composition of stone pavers, plantings and low ground cover.

這樣的表面是由石鋪面，植栽以及低矮的地被植物所共同譜成的樂曲美女a视频网站，經(jīng)歷年復(fù)一年的循環(huán)再生啊人妻系列无码转区久久五月天。

Microfiber Products detail: Microfiber refers to the so-called 0.4uM of the micro-diameter fibers, its fiber silk degrees only 1 / 10 special wedge-shaped cross-section to enable it to more effectively capture even a few microns of dust particles, decontamination, to oil the effect is very obvious. 75:25 of polyester / nylon ratio, making material is extremely soft, on the swab surface without any harm, even in the field of high precision, such as lens coating, large scale integrated circuit manufacturing process can also be assured that the use of its water volume, water absorption speed is ordinary cotton fabric for more than 5 times.

所謂超細(xì)纖維是指直徑0.4uM的微纖維，其纖維度僅為真絲1/10特殊楔型橫截面中国老女人老妇女刺激视频，使它能更有效地捕獲甚至幾微米的塵埃微粒A黄色网站在线播放，除污、去油的效果十分明顯久久久二级黄色片。75：25的聚脂/耐綸比欧美性交A级性爱免费黄片，使得質(zhì)料極其柔軟，對被拭物表面無任何傷害四虎国产精品久久久久久网址，即使在高精密領(lǐng)域里如鍍膜鏡頭免费精品自在拍精选在线观看AV、大規(guī)模集成電路生產(chǎn)過程中也能夠放心使用，其吸水量玖玖爱在线视频播放、吸水速度是普通棉織物的5倍以上精品人妻福利资源在线看。

With careful control of environmental conditions, measurement precision to the nanometer scale or below is possible with PSI.

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Aiming at solving the problem in the electrochemical oxidation of ammonia wastewater,the tin and antimony electrodes based on titanium were manufactured,the effect of different manufacturing condition to the impact of electrochemical oxidating ammonia wastewater was researched. After researching the influential factor and optimizing the manufacturing condition,the appearance analysis and the electrochemical analysis was hold on, the electroactivated character of the electrodes was studied to provide warrant to its application in the ammonia wastewater.

本論文從電化學(xué)氧化法處理含氨氮廢水的問題出發(fā)一级特黄a爱激情影院，對鈦基錫銻電極材料進(jìn)行研制，考察了不同的制備條件對含氨氮廢水的電化學(xué)氧化去除的影響丝袜人妻欧美，研究了各影響因素并優(yōu)化了制備條件欧美日韩三区二区三区二区，并對其進(jìn)行了表面形貌分析、電化學(xué)分析的研究丁香婷婷五月天综合，微觀地研究了電極的電催化性能在线观看国产技师自拍网站免费视频，為其應(yīng)用于實(shí)際氨氮廢水處理中提供了依據(jù)。