Researched influence of frequency on characteristic of electromagnetic wave transmission in tunnels, and analyzed characteristic of electromagnetic wave transmission in circular, arches and curved tunnels by method of metal wave guide, and gives approximate formulas of attenuation rate. Main conclusions we obtain are as follows: in circular,rches tunnels, if frequency is higher, attenuation rate is smaller, it is beneficial for EM waves to transmit, in curved tunnel, higher frequency, more attenuation rate ...

研究了頻率對(duì)井下電磁波傳輸特性的影響717免费理论电影，采用金屬波導(dǎo)法分析了圓形欧美性爱建材、拱形及彎曲隧道中電磁波的傳輸特性并給出衰減率近似公式，得出主要結(jié)論：在圓形和拱形隧道中一区二区三区日韩，頻率越高无码理论片，衰減率越小，越有利于電磁波的傳播；在彎曲隧道中国产盗摄Aⅴ一区二区，頻率越高，衰減率越大亚洲日韩精品不卡在线，不利于電磁波的傳播性色精品福利一区二区；通過特性曲線與井下實(shí)驗(yàn)數(shù)據(jù)相比較得出在900MHz左右為井下無線通信系統(tǒng)傳輸信號(hào)最佳頻段。

In this paper, resource and feature of three-dimensional data model to the arch tunnel and interior installation are mainly researched; design thinking of the arch tunnel model is given out; algorithms of three-dimensional model about tunnel body and the joint part of the adjacent to tunnel body are achieved; in addition, relevance algorithms of texture mapping technology to interior in tunnel body and three-dimensional model of interior installation of tunnel are also researched.

主要研究了拱形巷道及其內(nèi)部設(shè)備三維建模的數(shù)據(jù)來源和特點(diǎn)国产极品在线观看无码迅雷下载；給出了拱形巷道建模的設(shè)計(jì)思路女人阴道口被插视频；研究了實(shí)現(xiàn)巷道體和相鄰巷道體之間連接處三維建模的算法；另外也研究了實(shí)現(xiàn)巷道體內(nèi)部紋理貼圖技術(shù)及巷道內(nèi)部設(shè)備三維建模的相關(guān)算法亚洲黄的全免费在线观看；研究了實(shí)現(xiàn)三維巷道漫游的算法亚洲国产AV无码精品无广告。

And conclude that the impulsively started cross flow analogy is not suit precisely to predict the sectional side force distribution of slender body with a pointed ogive nose, because the pointed nose slender body exhibit an roll angle effects.

認(rèn)為脈沖起動(dòng)橫流比擬方法不適用于預(yù)測(cè)尖頭拱形細(xì)長體的側(cè)向力分布特性，因?yàn)榧忸^拱形細(xì)長體具有明顯的滾轉(zhuǎn)角效應(yīng)国产乱伦视频一区二区。

The king asked him to design a palace roofed with an arch.

國王叫他設(shè)計(jì)一座屋頂是拱形拱形的宮殿黄页视频在线学习。

Design a palace roofed with an arch On top of the arch there would be an artificial arch.

國王叫他設(shè)計(jì)一座屋頂是拱形拱形的宮殿。

Often,if the weather deck of a ship is cambered, the lower decks particularly in passenger ships may have no camber at all,at all,as this makes for horizontal decks in accommodation,which is an advantage.

通常欧美黄色免费网站一区二区，如果露天甲板被制造成拱形亚洲欧美国产丝袜一区，低位甲板尤其類似于客輪是不采用拱形的，而是在生活區(qū)采用比較更有利的水平甲板毛片视频a毛片。

Utilizing large-scale finite element software which is called ADINA to do numerical simulation of one colliery in Handan,the whole destroy process of the laneway is clearly saw which accompanied with the excavating,and the result is the same with the practical situation,providing a better method for the coved laneway deform research and stabilization analyse in complicated condition.

利用大型有限元軟件ADINA對(duì)邯鄲某煤礦拱形巷道進(jìn)行數(shù)值模擬欧美色一区二区，可以觀察到巷道隨著開挖的進(jìn)行，變形破壞的全過程黄片一级二级，其模擬結(jié)果與實(shí)際情況相符久操免费在线观看，為在復(fù)雜條件下拱形巷道的變形研究及穩(wěn)定分析提供較好的方法。

The shaker mount is first moved a small distance toward the arch ends to ensure that the arch possesses two stable equilibrium positions, one on each side of the base line. The spring connecting the arch end and the mechanical shaker is carefully chosen such that small shaker stroke can induce large vibration amplitude of the arch.

此外色视污网站大全，我們?cè)诩ふ衿髋c拱形梁之間外加一個(gè)彈簧做連接AA片免费看，這可使激振器在僅能達(dá)到有限的激振振幅下，仍能使拱形梁端點(diǎn)有足夠大的振幅產(chǎn)生国产免费观看黄AⅤ片久久，并使之能夠發(fā)生折斷式挫曲現(xiàn)象操欧美性爱。

The appearance is that of a fallen keystone in a broken arch.

外貌看起來是由倒下的拱形石破裂成拱形。

The fingers are moved by the arm in an arch, and when the tempo increases, the arch becomes flatter; at maximum speed the arch resembles a straight line.

手臂以拱形帶動(dòng)手指移動(dòng)国产一级黄色网站在线，當(dāng)速度增加時(shí)欧美丰满少妇XXXX性，拱形就變得平坦些；當(dāng)速度最快時(shí)免费囯产黄片无级A，那拱形變得象一條直線男人女人天堂视频一区,二区,三区。

arched beam：拱形梁

arch truss拱形桁架 | arched beam拱形梁 | arched girder拱形梁

arched beam：拱副梁, 拱形梁, 拱形轅桿

archecentric | 建筑中心的, 建筑的 | arched beam | 拱副梁, 拱形梁, 拱形轅桿 | arched body | 背弓, 腰弓

arched beam：拱形梁;拱副梁

arched abutment 拱形橋臺(tái) | arched beam 拱形梁;拱副梁 | arched boom 弧形弦桿

arched girder：拱形梁

arched beam拱形梁 | arched girder拱形梁 | archimedes principle阿基米德原理

arch gravity dam：拱形重力壩

arch dam拱壩 | arch gravity dam拱形重力壩 | arch structure拱形結(jié)構(gòu)

vaulted：有圓頂?shù)?圓頂?shù)?拱形的

vaudevillian /雜耍演員/ | vaulted /有圓頂?shù)?圓頂?shù)?拱形的/ | vaulting /拱形圓頂/圓屋頂/跳/跳的/跳過的/夸大的/

whaleback：船尾防浪損的拱形架龜背甲板

whaleback 船尾防浪損的拱形架 | whaleback 船尾防浪損的拱形架龜背甲板 | whaleback 龜背甲板

whaleback：船尾防浪損的拱形架

whale 鯨 | whaleback 船尾防浪損的拱形架 | whaleback 船尾防浪損的拱形架龜背甲板

arcaded gallery：拱形看臺(tái)

arcaded facade 拱形建筑物正面 | arcaded gallery 拱形看臺(tái) | arcaded ground floor 拱形底層

arch floor：拱形底板,拱形樓板

arch face ==> 拱面 | arch floor ==> 拱形底板,拱形樓板 | arch form ==> 弓形