对称的

The aluminium powder has been used to reduce titanium tetrachloride to generate the low valent titanium reagent which can induce the reductive coupling of aldehydes and ketones to form the corresponding pinacol s.

以价廉易得的铝粉还原四氯化钛制得低价钛，将其用于醛酮还原偶联，合成了6种片呐醇，其中对称片呐醇4种，不对称片呐醇2种。

In the special case when G = AutX, we call a G—vertex-transtive graph, G—edge-transtive graph, G—semisymmetric graph X is vertex-transtive edge-transtive semisymmetric graph respectively In this paper we investigate the autmorphism graph AutX of the cubic semisymmetric graph of order 12p ,when p is primes.

特别地，若G=AutX这时的G-点传递图、G-边传递图、G-半对称图称为点传递图边传递图半对称图。

Results Abnormal signal lesions were found in 47 patients with viral encephalitis, including multiple or single, symmetrical or asymmetrical large patch shape lesions, the located mainly in cortices, subcortical and basal ganglia and thalami. The lesions carried long T 1 and long T 2 on MRI. Enhanced MRI was performed in 22 cases, and demonstrated abnormal enhancement in 11 cases, including large patch or gyrus shape enhancement in 7 cases.

结果 病毒性脑炎脑内有多发或单发的对称或不对称大片状病灶，主要位于皮层、皮层下及基底节丘脑区，MRI呈长T1 长T2 信号，增强扫描22例，显示病灶强化者11例，其中呈大片状或脑回状强化者7例。

A general novel synthetic method to Symmetrically or unsymmetrically 2,3,6,7- substituted thieno[2,3-d:5,4-d\']dipyrimidine-4,5(3H,6H)-diones and 2-substituted benzothieno[3,2-d] pyrimidin-4(3H)-dione by utilizing aza-Wittig reaction was proposed firstly. This synthetic method has the advantage of easily accessible starting material, mild condition and good yields.

具体研究内容如下：1、首次研究了应用aza-Wittig反应方法合成2，3，6，7-对称与不对称四取代噻吩并[2，3-d；5，4-d\']双嘧啶-4，5(3H，6H)-二酮以及2-取代苯并噻吩并[3，2-d]嘧啶-4(3H)-酮衍生物的通用新方法，该方法原料易得，条件温和，收率较高。

The asymmetric and symmetric stretch modes of the NH2 group of APS moieties were expected to be observed at 3392 and 3352 cm-1,respectively.

的非对称与对称式伸展模式氨基黄芪多糖基集团预计将在3392和观察三三五二厘米- 1 。

Taking the problems stated above into account, the schemes for preparation of entangled states, quantum teleportation and remote state preparation are mainly discussed in this dissertation. The main results are as follows:(1) A scheme is proposed for preparation of the symmetrical W state and two kinds of unsymmetrical W-class states via cavity QED system.

基于以上想法，本文着重对纠缠态的制备、量子隐形传态和量子远程态制备两种量子信息远程传输方式进行研究，主要研究成果如下：(1)提出在腔QED中实现n-体对称W态及两种非对称类-W态制备方案。

No Third Party Keyholder, 2048 to 4096 bit Asymmetric and 256 bit Symmetric Key Encryption, Automatic Key and Contact Management.

没有第三党keyholder ， 2048年至4096位非对称和256位对称密钥加密，自动的关键和联系人管理。

Tested by practice, Bidirectional Symmetry mode evolutes into anew mode of Symmetrical Bidirectional Communication.

双向对称模式经过实践的检验，演变为对称双向传播新模式。

The effect of the friction between rolls and ring can be ignored and the effect of the spread velocity of rolling on the deformation of ring is illustrated.

通过模拟分析比较，揭示出了环件轧制过程中的金属流动规律：轧制时，环件外侧的变形最大，厚向中心部位变形最小，内侧的变形程度介于中间；环件内外环面的压应力分布和变化规律：在垂直于环件轴线的对称面上，压应力分布近似对称状态，而且在对称面上的应力最大，往端面方向开始减小；指出了环件轧制中轧辊与环件摩擦对环件成形的影响：对于环件的宽展变形，摩擦的影响很小，可以忽略；分析了环件进给速度对环件成形的影响并阐述了环件厚向中心部位凹陷产生的原因，提出防止凹陷的措施：在轧制时，尽量使用快的进给速度有利于防止端面凹陷的产生；研究了导向辊位置对环件成形以及轧辊受力的影响：导向辊的位置对环件的宽展变形影响很小，但对轧辊的受力影响较大，当导向辊的中心位置位于毛坯初始中心位置之上时，驱动辊和芯辊的受力相对较小，这是导向辊导向时优先考虑的位置。

The normal direction motion of the head block tips is excited by the anti-symmetrical mode.

利用定子的对称和反对称振动模态，在驱动足上形成椭圆振动轨迹。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失