The cavitation erosion behaviours of the main two steels used in hydroturbine are investigated in distilled water with and without sand by ultrasonic vibration equipment for cavitation erosion.

利用超聲振蕩空蝕實(shí)驗(yàn)機(jī)對兩種主要的水輪機(jī)用金屬材料進(jìn)行了清水和含沙水條件下的空蝕行為研究三级免费操逼视频。

Meanwhile, it is also illustrates that the smaller chromium carbides have less restriction to forming thin splats than larger ones, which beneficial to limit the size of pieces removed by impact of the sand particles, and the higher volume fraction of small chromium carbide may effect the erosion through enhancing interlamellar bonding of the splats which leads to increase the erosion resistance of the coating.

揭示了細(xì)小碳化物顆粒有利于獲得扁平粒子厚度較小的涂層結(jié)構(gòu)国产狼友91精品一区二区三区，可減小涂層沖蝕磨損過程中每次剝落的體積2020在线观看黄色视频播放网站；較高含量的細(xì)小碳化物顆粒有利于提高涂層扁平粒子間的結(jié)合毛片毛片一级毛片，從而提高涂層抗沖蝕磨損性能。

Soil erosion ; maximum precipitation erosion slope ; grass belt interplanting

土壤侵蝕性爱一级；坡度極限欧美视频在线观看熟；草帶間作

Invariableness wind velocity is used in experiment to measure soil erosion of different land use and then discover: Wind erosion quantity is close related to type of land use.

利用恒定風(fēng)蝕風(fēng)速，對不同用地風(fēng)蝕量進(jìn)行測定中文字幕黃色av，發(fā)現(xiàn)土壤風(fēng)蝕量的大小與土地利用類型之間有著密切的關(guān)系国产一级精品A级毛片，而土地利用類型決定了地表植被蓋度、土壤表層水分及土壤性質(zhì)男人插女人b动态图。

The nitrogen and pesticide in the topsoil with soil erosion go into river, lake and reservoirs and so on. So that the soil erosion reduced, the nocuous matter loss can be controlled as well, the sediment silt and water pollution in rivers, lakes and reservoirs can be decreased.

土壤中氮和農(nóng)藥等有害物質(zhì)的流失是以水土流失為載體一级欧美一级日韩α片，進(jìn)入江河、湖泊亚洲综合精品一区二区、水庫等水源地亚洲音影先锋在线，加大了這些水源地的污染，所以減輕了土壤水土流失量黄日韩国产在线观看，就能夠很好控制農(nóng)耕地有害物質(zhì)的流失99re6，減輕江河、湖泊欧美三级乱伦片、水庫等水源地的泥沙淤積和水質(zhì)污染A片在线视频免费看。

It is thought that high difinition CT scan not only accurately showed the position of cholesteatoma,but also the degree of bone erosion,and can early predict the develpment of otogenic complications,demonstrate non-typical extensive temporalbone erosion.

認(rèn)為高分辨率CT不僅能將膽脂瘤精確定位，而且還能顯示周圍骨質(zhì)的破壞程度freeeexxxx性欧美，能早期預(yù)測顱內(nèi)并發(fā)癥的發(fā)展无码毛片一区二区三区本码，確定不典型的廣泛破壞性病變。

Results positive findings of MRI in shoulder joint as follow, synovitis and enhanced bilateral pannus (93.5%), bone erosion (77.9%), cartilage erosion (90.3%),change of synovium and bone marrow was taken as diagnostic standard, the sensitivity, specificity, accuracy, 69.0%青草视频在线、76.7%最近最新2019中文字幕免费看视频、72.3%.

分析病變早期E-MRI特征。結(jié)果肩RA MRI陽性表現(xiàn)啪啪啪黄片视频海外版，滑膜增生血管翳形成(93.5%)大黑吊日逼视频，骨侵蝕(77.9%)，軟骨侵蝕(90.3%)等午夜福利小视频在线观看，以滑膜和骨髓改變診斷肩RA日韩精品网站日韩在线播放视频免费，其敏感性、特異性婷婷五月丁香六月综合、正確率分別為： 69.0%日韩一级婬片A片免费手机版、76.7%、72.3%。

According to the principles of synthesis, dominance, regionality and relative consistency, the environment degradation evaluation system is divided into three classes: vulnerable region, vulnerable type and vulnerable cell. The research area belongs to the erosion degraded Southern Red Hilly Area region. Based on the conceptions and grading, the dissertation probes into the methodology of evaluation and case study, and establishes a potential degradation evaluation system which comprises altitude, gradient, soil erosion index K, annual rainfall, the proportion of rainfall in raining period, and the drought index of rainless period.

在脆弱性概念及其分類的基礎(chǔ)上欧美乱伦视频，本文進(jìn)行了脆弱性評估的方法探討和實(shí)證研究18岁以下禁止进入黄色网站，在脆弱性分析的基礎(chǔ)上亚洲综合另类图片久久，選擇高度久热精品视频、坡度、土壤可蝕性K值国产一线高清免费A片在线观看、降雨量国产熟女高潮免费视频、暴雨量、多雨期降雨比重和少雨期干旱指數(shù)為潛在脆弱度指標(biāo)亚洲中文国内精品福；選取作為區(qū)域人地關(guān)系国产亚洲午夜精品、社會經(jīng)濟(jì)發(fā)展與管理水平綜合影響結(jié)果的人類活動指標(biāo)森林覆蓋率和坡耕地指數(shù)作為現(xiàn)實(shí)脆弱度評估的人為加速侵蝕的修正指標(biāo)，計(jì)算生態(tài)環(huán)境的現(xiàn)實(shí)脆弱度在线观看黄色视频毛片，并將其指標(biāo)體系與方法用于衡陽盆地生態(tài)環(huán)境脆弱度評估的實(shí)證研究国产迷奸在线观看。

The carrying capacity of water resources and water environment in Yellow River basin is faced with a huge challenge, such as vegetation destruction, water and soil erosion, riverbed run-up, watercourse shrinkage, water shortage, frequency breakage flow, severity pollution, water quality deterioration, trace to the source and sendiment, coast erosion and regradation.

植被破壞、水土流失欧美一级做一级a做片性，河床抬高啊用力插视频、河道萎縮，水源匱乏成年美女黄网站18禁免费动态图、頻繁斷流国产毛片在线看线，污染嚴(yán)重、水質(zhì)下降久久久久国产精品爆乳，朔源淤積色一区二区、海岸蝕退等表明黃河流域水資源與水環(huán)境的承載能力面臨著極大的挑戰(zhàn)。

Rubber powder could improve salification erosion resistance, and the more rubber powder, the better salification erosion resistence was. But the effect of rubber powder particle diameter was not obvious.

橡膠粉的摻入提高了水泥土的抗鹽蝕能力亚洲高偷拍一区二区三区，且橡膠粉摻量越高好大好爽插我视频在线播放免费，抗鹽蝕能力越強(qiáng)，但橡膠粉粒徑的影響則不顯著全球二级三级黄视频。