Why are the florets in a sunflower arranged in a double spiral?
为什么葵花的小花呈双螺旋型排列呢？
Conclusion: Double spiral CT can display the complications after liver transplantation.
结论：双螺旋CT能清楚显示肝移植术后的并发症影像。
At last, cylinder of double spiral roller grinded-paste machine is produced by centrifugal casting.
最后，通过离心铸造生产出双螺旋辊式磨浆机筒体。
At its center you will find a double spiral staircase that was said to be designed by Leonardo da Vinci.
在它的中央你可以看到一座据说是达芬奇设计的双旋楼梯。
Objective To optimize parameters with double spiral computed tomographic angiography(SCTA) for visualization of portal veins.
目的评价双螺旋CT血管造影（SCTA）不同扫描层厚和螺距对门静脉成像质量的影响。
Separate method: Archimedes spiral centrifugal force. Double spiral is more advantageous to part liquid dreg and not easy to block.
分离方式：采用阿基米德螺旋离心分离，双螺旋更利于渣液分离，不易堵塞。
The foundation of DNA double spiral structure model is the miracle and milestone in the history of life science. It has epoch-making significance.
DNA双螺旋结构模型的建立，是生命科学史上的奇迹和里程碑，具有划时代的意义。
The pavilion is a double spiral with pedestrian and cycling lanes that takes the visitors from the ground through two ramps, up to a level of 12 meters, and down again.
丹麦馆是采用双螺旋结构造型，其人行道和车行道，从地面盘旋两次到达12米的高度，又盘旋而下回到地面。
The double spiral wire solders are adopted to improve the connecting strength and reduce the overlapping coefficient to less than 50 percent, thereby reducing the cost.
采用双螺旋焊线提高了连接强度，减少了重叠率使之小于50％，从而达到成本低。
The spiral classifier divided: high weir single spiral classifier, high-Weir type dual spiral classifier, spiral classifier single sink, sinking double spiral classifier.
该螺旋分级机分有：高堰式单螺旋分级机、高堰式双螺旋分级机、沉没式单螺旋分级机、沉没式双螺旋分级机。
The hot zone is formed by cutting a double spiral slot which reduces the cross sectional area through which current flows, resulting in higher resistance than the cold end.
发热部是双螺旋切槽，在电流通过时可以减少其横截面积，因而发热部的阻值比冷端部的阻值大。
The general situation, application features and technological and economic aspects of a new drying equipment composed of a double spiral dryer and a disc dryer are described.
介绍了新型干燥设备双螺旋干燥机和盘式干燥机结构及其应用情况。
The results of calculation indicates that the static axial stiffness of fluid film in double spiral groove face seal is improved due to the pressure loss through feeding holes.
计算结果表明， 供液小孔所产生的压力损失提高了双列螺旋槽机械密封的静态轴向刚度。
Seal chamber pressure of a new double spiral groove face seal working under high velocity and pressure conditions may probably be disturbed in operation, which affects the seal stability.
一种用于高速高压等极端工况下的新型双螺旋槽端面密封在实际运行过程中密封腔压力会出现波动，从而影响密封稳定性。
Since the nucleic acids contain phosphonic group, basic group, desoxyribose hydroxy and double spiral species in nucleic acids, nucleic acids form easy multicomponent complexes with metal complex.
由于核酸含磷酸基团、碱基、脱氧核糖羟基以及双螺旋结构，使金属络合物容易在这些位置发生多元络合反应。
DNA is the basis of all life on earth. It has a double helixstructure， like a spiral staircase.//
DNA是地球上所有生命的基础，它有着像螺旋式楼梯一样的双螺旋结构。
Normal, double-helix DNA is spiral , like a loosely coiled spring.
正常的双螺旋DNA是螺旋形的，像一根松松地卷曲的弹簧。
The wheel head can be orientated in double axes so that any spiral Angle and back Angle may be adjusted rapidly.
该机床磨头可以又轴定位，任何螺旋角和后角均可快速调整。
DNA is a double stranded molecule shaped like a spiral staircase.
DNA是一种像螺旋阶梯样形状的双链分子。
Double-door entry has lovely spiral staircase with lots of natural light.
双门入口有可爱的螺旋楼梯和大量的自然光。
Objective To evaluate double dose contrast medium spiral ct cholangiography (SCTC) and 3d reconstruction technique in clinical applications.
目的评价双剂量法螺旋CT胆道造影(SCTC)及三维重建技术的临床应用价值。
Its basic gear tooth profile is double circular arc spiral bevel gear tooth profile.
双圆弧弧齿锥齿轮是将点啮合制圆弧齿轮传动形式运用到锥齿轮上的成功例子。
On the base of both consideration of heat transfer performance and resistance, the optimization and research are carried out on single spiral duct double pipe condenser.
本文在综合考虑传热性能和摩擦阻力等因素的基础上，对单螺旋槽套管式冷凝器的结构进行了优化和研究。
Objective: to discuss the predictive value of double air contrast radiography and spiral computed tomography in the diagnosis of colon carcinoma.
目的：探讨气钡双重造影及螺旋CT对结肠癌诊断的临床应用价值。
Spiral welded pipe is a strip coil as raw material, often warm extrusion molding, to automatically double-wire submerged arc welding process double-sided spiral welded pipe joints.
螺旋焊管是以带钢卷板为原材料，经常温挤压成型，以自动双丝双面埋弧焊工艺焊接而成的螺旋缝钢管。
Through the calculation of the finite element method(FEM) models for double circular arc profile spiral bevel gear, the stress changing pattern along the length of the tooth is obtained.
用有限元方法，对双圆弧弧齿锥齿轮沿齿长方向齿根应力进行了计算。通过应力计算结果的分析，得出了凸、凹两齿侧应力沿齿长的分布规律。
Ore washing machine is divided into the single spiral ore washing machine and the double helix ore washing machine.
洗矿机分为单螺旋洗矿机和双螺旋洗矿机。
A double core high-temperature cable and the thrum of the spiral coil are welded in the I-shaped circular framework, and then extend out and are connected with a linker box arranged on a ladle shell.
双芯高温电缆与螺旋形线圈的线头在工字形圆环骨架内焊接后穿出，与装在钢包壳体上的连接器盒连接。
This paper provides reference for later research and application of double-circular-arc spiral bevel gears.
论文工作为今后双圆弧弧齿锥齿轮的进一步研究及推广应用提供了参考依据。
The second research of the thesis is to design a double-patterns four-arm plane spiral antenna with the background of wideband circular polarization plane antenna's technology.
论文的第二个研究工作是以超宽带圆极化平面天线为研究背景，设计了一个双模四臂平面螺旋天线。
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