查询词典 twin brother

Methods The components of somatotype were calculated by using Heather-Cater method in a total of 376 twin pairs of Han nationality,including 245 monozygotic and 131 like-sex dizygotic twin pairs aged 6 to 18 years.

方法采用Heath-Carter法对376对6~18岁同性别汉族双生子(同卵双生子245对，异卵双生子131对)的体型三因子进行计算。

Methods The triceps and subscapular skinfolds were measured and the body composition were estimated by using Changling's and Brozek's models in a total of 376 twin pairs of Han nationality,including 245 monozygotic and 131 likesex dizygotic twin pairs aged 6 to 18 years.Modelfitting method with Mx package was performed to evaluate the proportion of variance components and to analyze the effect of sex,age and development period on the skinfold thickness and body composition.

测量376对6～18岁同性别双生子(同卵245对，异卵131对)肱三头肌、肩胛下皮褶厚度，用长岭和Brozek公式估算体成分；用Mx软件拟合最佳模型，计算各指标遗传与环境方差组分，分析年龄、性别和不同发育期的作用。

Moreover, the hot compressive deformation behavior of the RS/PM AZ91 magnesium alloy and AZ91 alloy matrix composite were also investigated, the conclusions are drawn as follows:1. The processing parameters of the atomization-twin rolls quenching technology were optimized as follows: the diameter of the nozzle 1mm, the wheel velocity 25m/s, the pressure of atomization gas 0.3MPa and Ar gas for melt injection 0.1MPa. The RS AZ91 alloy flakes exhibited fine and uniform microstructures. When the flakes were extruded at 673K, extruded velocity of 0.1mm/min and extrusion ratio of 25:1,the magnesium alloy rods with clean surface, uniform dimension and excellent mechanical properties were obtained.2. The RS AZ91 magnesium alloy powders prepared by atomization-twin rolls quenched technology exhibited fine equiaxed grains with the grain size of 1-3μm, the phase constituent included supersaturate solid solution phaseα-Mg and miner fineβ-Mg_(17)Al_(12) phase. The as-extruded materials also exhibited equiaxed grains with the size of 5-7μm and a large number of fineβ-Al_(12)Mg_(17) and fewer AlMg_2Zn phases were detected in the alloy.

本文还研究了快速凝固/粉末冶金AZ91镁合金热压缩变形流变应力行为，快速凝固/粉末冶金法原位生成Mg_2Si增强AZ91镁基复合材料，经过系统的研究，获得如下结论：1、雾化-双辊急冷法在下列工艺参数组合下：双辊线速度25m/s；喷嘴直径1mm；熔体压射压力0.1MPa；雾化气体压力0.3MPa。，可获得宏观尺寸细小、微观组织均匀细小、综合性能优良的的快速凝固AZ91镁合金细碎箔带，快速凝固箔带在挤压温度为673K、挤压速度为0.1mm/min，挤压比为25：1时，可获得的外表光洁、尺寸均匀、组织性能优异的镁合金棒材。2、雾化-双辊急冷法制备的AZ91镁合金粉末态为细小等轴晶组织，晶粒尺寸1-3μm，组织为α-Mg过饱和固溶体和微量的细小β-Mg_(17)Al_(12)相组成；粉末挤压棒材为等轴晶组织，晶粒尺寸5-7μm，组织中含有大量细小的β-Al_(12)Mg_(17)以及AlMg_2Zn析出相，室温力学性能，抗拉强度383MPa，屈服强度275MPa，断后伸长率7.5%。

The principle of twin symmetry roll axle-mill was introduced.A new process was proposed which was for twin symmetry roll axial rolling passive spiral bevel gears.The deformation process by the new technology was analyzed by rigid plastic FEM software.Rolling force was calculated in theory.

介绍了对称双辊轴向轧机原理，提出了对称双辊轴向轧制成形螺旋锥齿轮新工艺，利用刚塑性有限元模拟软件对新工艺变形过程进行了仿真分析，对成形工艺力进行了理论计算。

Among these was the Mikoyan MiG-25 Foxbat, a twin-engined, twin-tailed fighter capable of a Mach 2.8 performance.

他们中间有米高扬的米格-25狐蝠，一种双引擎，双垂尾，速度达2.8马赫的战斗机。

Sikorsky S-92 twin-engined medium-sized helicopters price, S-92 Sikorsky Aircraft Corporation in the United States to develop a medium-sized twin-engined helicopter price.

西科斯基S-92双发动机中型直升机价格，S-92是美国西科斯基飞机公司研制的双发动机中型直升飞机价钱。

Twin-screw extruder design should include twin-screw extruder, overall scheme of the types of extrusion system design, the design, the transmission system, the design of the system, heating and cooling system design, the design of control system, etc.

双螺杆挤出机设计应包括双螺杆挤出机类型的确定，整体方案的确定，挤压系统的设计，传动系统的设计，加料系统的设计，加热冷却系统的设计，控制系统的设计等。

Weapons: The Doomblade mounts 2 X Multi-Lascannos, 2 X Conqueror cannon, a twin-linked heavy bolters, a Laser Destroyer, twin Doomblade Vanquisher cannons

武器：末日之刃装备2门多管激光炮，2门征服者加农炮，1座双联重矢弹枪，1门激光毁灭炮，双管末日之刃型粉碎者加农炮。

Based on the research on the solidifiation of twin-roll casting strip,the analytical model and emulational model of nucleation,the growth of dendrity tip and colunar dendrity transformation to equiaxis dendrityof twin-roll casting strip solidification are established by means of the principle of metal solidification and modern computer emulational technology.

在研究双辊薄带连铸工艺凝固过程的基础上，运用金属凝固的基本原理，并用现代计算机仿真技术建立了双辊连铸薄带凝固的形核、枝晶尖端的生长动力学、柱状晶向等轴晶生长的转变的解析模型及仿真模型，为双辊连铸薄带凝固组织形成的仿真模拟奠定了基础。

I have a twin elder sister, possible because is the twin, I and the elder sister put on the same clothes since childhood, moreover long resembling, always receives very many human of attention, always feels extremely embarrassedly.

我有一个双胞胎姐姐，可能因为是双胞胎，/，我和姐姐从小穿同样的衣服，，而且长的相象，总是受到很多人的关注，，总是感到非常不好意思。。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？