Wing bud differentiation initiated at the early 5th nymphal instar, during which the front wing bud cells in the macropterous proliferated much more rapidly than those in the brachypterous. The hinder wing buds of the brachypterous degeneratd at middle 5th instar and finally turned out to be very little wings.

在5齡初始時才發(fā)生翅芽發(fā)育的分化，之后ww97在线观看，短翅型若蟲的前翅芽細(xì)胞增殖速度明顯慢于長翅型亚洲综合操逼网，到五齡末期，細(xì)胞數(shù)量積累明顯少于長翅型日黄色网址，短翅型的后翅芽在5齡中期開始退化變短2020黄色在线，羽化后變成一個退化的小翅。

As a result,the venations of Mylabris Fabricius were tentatively classified into three types as follows:Southern type,represented by Oriental species,wing dark brown with a lot of folds,veins stout and highly sclerotic;Plateau type,represented by Qingzang Plateau endemic species,wing ivory-white and semitransparent,only the large cell enclosed by costal margin and MP_ 1+2 obvious;and Northern type,as the transition between the former two types,represented by Palearctic species,wing brown,veins clear and moderately sclerotic.

研究結(jié)果將斑芫菁屬翅脈歸納為3種類型：1南方型：東洋種国产日韩欧美在线，翅深褐色精品中的精品自拍，各脈粗大，骨化程度高全网在线观看黄色网站，皺褶多而明顯一级a性色生活片久久毛片照片；2高原型：青藏高原特有種，翅乳白色未满十八18禁止免费网址，半透明一级A片一级少妇片毛片，僅前緣和MP1+2形成明顯的大翅室，余脈淡而不顯日韩一日韩欧美中文字幕，骨化程度低亚洲,欧洲,乱伦；3北方型：為以上兩種類型的中間過渡，古北種一区二区在线看日韩视频免费，翅褐色国产精品苐一页狼友视频，各脈清晰，中度骨化免费精品国自拍视频在线观看。

As a result, the venations of Mylabris Fabricius were tentatively classified into three types as follows: Southern type, represented by Oriental species, wing dark brown with a lot of folds, veins stout and highly sclerotic; Plateau type, represented by Qingzang Plateau endemic species, wing ivory-white and semitransparent, only the large cell enclosed by costal margin and MP(subscript 1+2) obvious; and Northern type, as the transition between the former two types, represented by Palearctic species, wing brown, veins clear and moderately sclerotic.

研究結(jié)果將斑芫菁屬翅脈歸納為3種類型：l南方型：東洋種中文字幕第一页在线，翅深褐色，各脈粗大日韩欧美亚洲视频在线，骨化程度高99久久精品国产精油按摩店，皺褶多而明顯；2高原型：青藏高原特有種久久国内精品一国内精品，翅乳白色99国产网站，半透明，僅前緣和MP(下標(biāo) 1+2)形成明顯的大翅室，余脈淡而不顯亚洲另类小说，骨化程度低另类精品视频；3北方型：為以上兩種類型的中間過渡，古北種视频二区自拍偷拍，翅褐色十八岁禁止入内黄色网站，各脈清晰，中度骨化94seav。

Firstly, the high resolution pictures of dragonfly wings from sample tests were studied thoroughly, and the unique feature of the reticulate vein distribution and the variation of the vein sizes and the grid shapes in different zones were figured out;then several computational models based on a dragonfly wing were established by using ANSYS, and beam 189 and shell 93 elements were used respectively in modeling of the veins and the membrane so as to ensure the compatibility between the veins and the membrane at a deformed state;these models subject to uniform loading cases were analyzed respectively so as to explore the unique performances of the wing structure, furthermore, through eigenvalue spectrum analyses of these models, the special role of the pterostigma in eliminating or suppressing the wing quivering effect was also evaluated.

首先欧美精品国精品久久99热，對實驗中獲取的高清晰度的蜻蜓翅膀數(shù)碼圖片進行了細(xì)致地分析，找出了翅膀網(wǎng)狀翅脈結(jié)構(gòu)中翅脈的分布規(guī)律與尺寸變化免费看黄片av、網(wǎng)格形狀的差異及不同形狀網(wǎng)格的分布等獨特的結(jié)構(gòu)特征亚洲视频国内自拍；再利用ANSYS建立蜻蜒翅膀網(wǎng)狀翅脈結(jié)構(gòu)模型，采用三節(jié)點等參數(shù)梁元beam189模擬翅脈和八節(jié)點等參數(shù)曲殼單元shell93模擬翅膜www黄色小说com...，以滿足翅脈和翅膜間的變形協(xié)調(diào)性要求久久久经典中文字幕一区二区三区；通過非線性數(shù)值分析，探索了蜻蜓翅膀網(wǎng)狀翅脈結(jié)構(gòu)在均布荷載作用下所具有的獨特的結(jié)構(gòu)性能色妞一区二区三区免费视频；通過模態(tài)分析久久久久亚洲精品中文字幕A片，揭示了翅膀前緣靠近翼尖附近的翅痣在翅膀消震減振中所發(fā)揮的作用。

Several models with different cambered corrugation were evaluated, it demonstrates that the wing becomes stiffer with the increase of the cambering and corrugating magnitude of the wing structure, while the material consumption of the wing and its deadweight increase at the same time.

通過對具有不同網(wǎng)格尺寸的結(jié)構(gòu)模型進行靜力分析免费无码A片国在线看视频，得出大網(wǎng)格結(jié)構(gòu)模型的剛度較大国内精品一区二区三区香蕉；小網(wǎng)格結(jié)構(gòu)模型的剛度較小，但可以降低材料用量日韩综合无码视频一区二区三区。

The most outstanding characteristic of this plane is the rotor wing, which can circumrotates in high speed like a rotor as well as locks like a fixed wing. This makes the plane have the abilities of taking off and landing vertically like a helicopter and cruising in a high speed like a fixed wing plane.

它的最大特點是有一副既可以高速旋轉(zhuǎn)作為旋翼最近最新中文字幕视频，又可以鎖定作為固定翼的旋轉(zhuǎn)機翼，使其既可以像直升機那樣垂直起降和定點懸停美女强奸毛片，又具有噴氣式固定翼飛機的高速巡航能力一级黄色片日本。

It is found that the side-wall where the wing is set on is of great influence on the flow of wing/side-wall juncture and calculation results around wing mounded in the wind tunnel are in good agreement with experimental data.

計算表明，機翼安裝側(cè)壁對實驗結(jié)果影響很大欧美精品第8页，模擬風(fēng)洞邊界的計算結(jié)果與實驗結(jié)果吻合很好91国内自拍视频在线观看。

Shenzhen high-wing Technology Co., Ltd. is mainly engaged in three-color phosphors and LED decorative lighting products and sales. 1992 high-wing technology trichromatic phosphors begin mass production, the company trichromatic phosphors in the domestic production industry, the first in the use of nitrogen, hydrogen precursors to protect the production of ultra-high-temperature tunnel furnace trichromatic green powder and blue powder, the first technology would be Jet Milling for phosphor production, enhance production of the first color phosphor of bimodal powder blue. High-wing technology in 2004 began producing LED lighting products have been developed, including LED string lights, cup lights, bubble lights, tube lights, LED lights×, LED signs, lights, cast ray lamp, underwater lamp, rainbow tubes and LED flashlight series of applications and achieve bulk export the European Union, the United States, Australia, Africa, Asia and other countries, in the domestic market has volume applications.

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A thick wing, full-length leading-edge slats and trailing edge "Junker" type flaperons develop a maximum wing lift coefficient of 3.10, while maintaining a short wing-span of less than 31 feet.

厚榮欧美亚洲一区二区，完整長度的領(lǐng)先優(yōu)勢的縫翼和尾緣&克&型flaperons發(fā)展的最高機翼升力系數(shù)的3.10 ，同時保持在短期內(nèi)永大跨度少于三十一英尺欧美黄色视频免费体验。

The faster-moving air going over the top of the wing exerts less pressure than the slower-moving air under the wing and, as a result, the wing is pushed upwards by the difference in pressure between the top and the bottom.

快速移動的空氣將會超過上方的機翼施加壓力不足免费看黄网站在线观看www，比慢移動的空氣下，機翼和国产午夜亚洲精品区，因此天堂在线www天堂日韩视频，聯(lián)隊是向上推，由不同的壓力之間的頂部和底部男女gif出入抽搐动态图。