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With this method, calculating the flow at the running point of 60% load in the draft tube of a power station, which have a severe stability problem, accordingly gaining the frequency of the vortex flow and supply a gap for computing the unsteady flow in draft tube.

依據(jù)該方法92精品视频，就國(guó)內(nèi)某振動(dòng)問題比較嚴(yán)重的水電站的尾水管進(jìn)行了60％負(fù)荷工況點(diǎn)的不穩(wěn)定流場(chǎng)計(jì)算日韩人妻无码精品久久中文字幕，首次通過計(jì)算的方法得到了尾水渦帶的頻率特性，填補(bǔ)了這一領(lǐng)域的空白国产三级片尤物视频。

Under partial load conditions the draft tube 3D simulation results showed that the climax of pressure fluctuation of draft tube vortex incepted at the underside of cone part closed by bend and the frequency of the pressure fluctuation accorded with times frequency rule very well.

部分負(fù)荷工況下尾水管內(nèi)三維非定常計(jì)算結(jié)果表明国产黄色片视频手机免费观看，尾水管渦帶壓力脈動(dòng)最大發(fā)生在直錐段下面靠近彎肘段，并且脈動(dòng)頻率符合實(shí)際的倍頻規(guī)律好大好爽好湿美女在线视频，從而驗(yàn)證了簡(jiǎn)化公式的正確性日韩一级一区。

Methods Retrospective analysis of 120 cases with multi-slice abdominal CT scanning were randomly and equally divided into experimental group and control groups, which group was 60 cases, respectively using automatic tube current modulation techniques and constant tube current in abdominal CT examination, the statistics were weighted CT dose index, dose-length product and effective milliampere seconds to compare image noise characteristics and the details show results.

回顧性分析我院腹部多層螺旋CT檢查120例，隨機(jī)分為實(shí)驗(yàn)組與對(duì)照組各60例超碰在线色婷婷，分別采用自動(dòng)管電流調(diào)制技術(shù)和固定管電流技術(shù)進(jìn)行腹部CT檢查，分別統(tǒng)計(jì)CT劑量權(quán)重指數(shù)影音无码资源、劑量長(zhǎng)度乘積及有效管電量亚洲黄网页，并對(duì)圖像噪聲特性、細(xì)節(jié)顯示結(jié)果進(jìn)行比較欧美性日本黑人HD。

This technique requires less treatment on the surface of the tube and needlessness of heat treatment to the tube, in addition, there is no need of large machines.

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The vertebrate embryonic structure that is located just dorsal and lateral to the neural tube; it is formed from neural plate cells that break away as the neural tube is being formed; the neural crest develops into the PNS.

脊椎動(dòng)物的胚胎結(jié)構(gòu)，是在神經(jīng)管的背向和側(cè)向国产第一页屁屁影院；他是從神經(jīng)板細(xì)胞形成的欧美视频经典亚洲，如同神經(jīng)管被打破而形成；神經(jīng)冠發(fā)展至周邊神經(jīng)系統(tǒng)。

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