The other two, thymine and cytosine, are single ring structures called pyrimidines.
另两个为胸腺嘧啶和胞嘧啶，即称为嘧啶的单环结构。
As star structure is superior over bus and ring structures in operational maintenance, transmission time and so on, dual-star structure is proposed for process level networking.
星形结构在运行维护、传输时间等多方面优于总线型、环形结构，宜采用双星形结构构建过程层网络。
The compounds have the connecting ring structures of piperazine or piperidine, have notable antitumor activity, and provide a new choice for preparing antitumor drugs in clinical practice.
该类化合于具有哌嗪或哌啶的连接环结构，且具有显著的抗肿瘤活性，为临床上制备抗肿瘤药物提供了新的选择。
For tubular structures, such as blood vessels, the hydrogel is printed in the centre and around the outside of the ring of each cross-section before the cells are added.
在生产管状结构，例如血管时，每一层细胞涂布之间，水胶会被涂布到血管截面的内外来形成支撑。
This paper presents four kinds of common SDH network topological structures, i. e. linear, ring, star and meshed.
本文介绍线形、环形、星形和网孔形等四种常用的SDH网拓朴结构。
Alar cartilaginous fibrous ring and alar cartilaginous muscular ring are very important anatomic structures to maintain the shape of the lower part of the nose.
鼻翼软骨纤维环和鼻翼软骨肌肉环是维持外鼻下端形态和鼻孔对称的重要解剖结构。
This paper describes basic structures and working principle for the machine for cutting and expanding the wheel lock ring, showing the design concept about essential elements.
介绍挡锁圈扩切机基本结构及工作原理；机床的几个关键部位的设计构思。
The virions budding from cytoplasmic membrane of infected cells, the ring like particle and multilaminated structures in cytoplasm of infected cells were observed.
在大部分病毒里能清晰地看到核芯壳，成熟的病毒从感染细胞的胞浆膜上出芽，在胞浆中还见到了花环状粒子和多板层结构。
The conclusions of this paper will provide important guidance to investigating the optical transitions and spectral structures in quantum ring.
文章结果对研究量子环的光跃迁及光谱结构有重要指导意义。
In present paper, a new type of ring-stiffener, called the ring-stiffener of half-tube, is introduced in pressurized cylindrical shell structures.
本文提出了半圆环壳型肋骨加强的耐压圆柱壳结构形式，在理论和模型试验研究的基础上建立了设计计算方法。
The paper sums up the representative structures, consisting of series-connection structure, parallel-connection structure, cold spare structure, hot spare structure, and ring spare structure, etc.
本文对卫星系统的典型结构进行了总结，主要包括串并联结构、冷热备份结构、环备份结构等。
The utility model provides a simple pipe binder used for pipe bundles in various mechanical structures, comprising a buckling sheet, a stud, a cylinder conductor, a jacket, and a pipe bundle ring.
本实用新型提供一种可在各种机械结构中用于管束的简易管束器。
Binding energy and interaction potential of calcium cation and diazine ring are based on the calculation of all the complexes of optimized structures.
对优化得到的稳定配合物计算了钙离子与二嗪的结合能和相互作用势。
In chapter 6, the structures and functions of damper are discussed, some design guidelines of the rubber o ring damper are developed.
第六章，讨论了阻尼器的结构和特性，提出了阻尼器结构设计的几个要点。
The structures of the electric field shielding ring, arc contact, main contact and nozzle etc. have been optimized, analysed and discussed respectively, and they are optimized synthetically at last.
主要对均压环、弧触头、主触头、喷口等结构进行了优化及分析，分别进行了讨论。并且进行了综合优化。
Results of analysis with IR and ESCA showed that ring -shaped conjugated structures exist in the films. Copper atom may be linked to the polymer either by covalent bond or coordination bond.
红外光谱和电子能谱的分析结果表明：聚合物薄膜中含有环状共轭结构，铜与聚合物以共 价键、配 位键结合。
Results of analysis with IR and ESCA showed that ring -shaped conjugated structures exist in the films. Copper atom may be linked to the polymer either by covalent bond or coordination bond.
红外光谱和电子能谱的分析结果表明：聚合物薄膜中含有环状共轭结构，铜与聚合物以共 价键、配 位键结合。
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