成双的

Although benzene is often represented with alternating single and double bonds between carbon atom s, the electrons in the bonds are shared or delocalized in such a way as to make all carbon-carbon bonds alike.

虽然往往把苯描绘成碳原子之间按单、双键交替排列，但事实上键中的电子是共享的，或者说是非定域的，其结果是使所有的碳原子都是等同的。

Electrically charged specks of interstellar dust organize into DNA-like double helixes and display properties normally attributed to living systems, such as evolving and reproducing, new computer simulations show.

最新的计算机模拟显示：星际尘埃中带有电荷的微粒排列成类似 DNA 的双螺旋状，并展现出只有生命系统才具备的特性，如进化和繁衍。

DsRNA technology was discovered recently, and many studies demonstrated that it could suppress genes more effectively than antisense technology. Inverted repeats of 800 bp TCS cDNA fragments sandwiching a 400 bp GUS gene fragment was inserted into the binary vector pBI121 and placed under the control of 35S promoter, forming a dsRNA expression vector.

DsRNA技术是近几年才刚刚发展起来的新技术，将上述DNA片段正向和反向插入到双元载体pBI121的35S启动子下游，两片段之间由约400 bp的GUS基因片段隔开，形成反向重复序列，由此构建成了表达TCS基因dsRNA的中间表达载体。

This paper aims at the research of line words, which are composed of action morpheme and the noun morpheme .All these line words comes from "Modern Chinese Dictionary".

本文研究的对象是动、名语素组合成的离合词，研究的范围是《现代汉语词典》中所收录的能插入其他成份的双音节词语。

So the defocus quantity is calculated by detecting the image spot position offset and the front focus plane of the collimation lens can be adjusted on the first image of the theodolite.

该方法利用半反半透镜将准直物镜后的物光折转，采用双分离透镜将目标成像到CCD上，经视频驱动、放大电路、再经A/D转换后输入到微机进行图像信号处理，这样，通过检测像的偏移量求出离焦量的大小和方向，然后驱动调焦部件使准直镜的前焦点在经纬仪的第一像面上。

A conjugate addition of alkadienyl carbonyl compound with vinyl palladium intermediates which can be formed from oxypalladation of alkynes or allenes was studied, and 1, 6-addition products were obtained.

发现不饱和烃的分子内氧钯化得到的烯基钯中间体能够与不饱和共轭双烯的醛酮反应，选择性的得到1，6-加成产物。

I am using a Comet UH6V and will be changing to a different antenna soon, probably and planning on using a Ham Stick for 10, a Larsen NMO-50 for 6 and the Larsen 2/70 for 144/440 or maybe a Comet SB-15 and a HamStick and then one less duplexer.

我正用的是COMET的VH6V，不久就要换成其它天线，大概的计划是使用HAM STICK的型号10的天线，一根LARSEN NMO-50用在6米段，LARSEN 2/70用在144/440这两段，或者是一根COMET SB-15天线和一根HAMSTICK天线，再加上一个双工器。

Changed the two screws on the contact plate of the Halo-Vest to one screw,so that the Halo-Vest can fit extension-flexion movement and adapt the reduction of cervical spinal dislocation.Simultaneously,in order not to reduce the fixed funtion of the contact plate,which was designed in fan-shape.

将传统的Halo-Vest架头环与架子接板的双螺丝改为单螺丝，使不能伸屈的头环变为能够伸屈；将头环与接板的咬合面设计成扇形并且有放射状条纹，使头环能牢固地固定在任何一个伸屈角度上。

This is a new kind of photoinduced phenomenon and it is a one-photon process.(2)A bipolaron is split into two polarons by photoexcitation.This photoinduced splitting converts a charge carrier into two spin carriers.(3)When the hopping effect is included, the energy of a soliton-antisoliton pair can be lower than that of single polaron in conducting polymers with degenerate ground state.

这是一种新的单光子过程光致现象；（2）通过光激发，一个双极化子可以分裂成两个极化子，这种光致分裂效应将一个荷电载流子转换为两个自旋载流子；（3）对具有简并基态的导电聚合物，如果计及跃变常数的变化这一效应，孤子-反孤子对的能量可以低于单个极化子的能量。

Peter's Square, one of the largest squares in the world, as the architecture masterpiece of Benigni. From 1656 to 1667, Benigni used 248 columns and 88 pilasters to make this grand elliptic square. In this square, there is the St.

绝不可错过的有圣比得广场，世界上最大的广场之一，贝尼尼的建筑杰作，他在1656至1667年间用284根和88根的双排柱围成了宏大的椭圆形广场。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。