单中心的

We investigate the centralizer of an arbitrary element of a Lie algebra of type L and obtain a sufficient condition for a Lie algebra of type L being semisimple.

在李代数方面，我们研究了L-型李代数中任一元素的中心化子，给出了L-型代数为半单代数的充分条件。

This paper transforms the pattern learning in the extraction of binary relation into the learning of centre of single text class.

本文首先将在二元关系抽取中的模式学习问题转化为单类文本中心的学习问题。

Urolithiasis in Pediatric Patients: A Single Center Study of Incidence, Clinical Presentation and Outcome

儿童患者的尿石病：一项单中心有关发病率，临床表现以及结果的研究

Vehicle breaks down the old one-unit administerial system and puts political activity in a new framework, new territory and new process.

载体创制格局打破了原来行政体系的单中心位置，使政治活动在一个新框架、新领域与新方式下进行。

In this section, applying the method, from abstract to specific and from history to present, it analyzes the operation mechanism of urbanization economy affected by market mechanism; puts forward four theories of urbanization economy from economic perspective, including agriculture surplus and comparison advantage; non-agricultural industry; agglomeration economy and spillover effect, on this basis of the theories, it, on one hand, analyzes two kinds of internal mechanism in the chronologic operation of urbanization economies: increasing mechanism of urbanization economies in urban output industry; and changing mechanism from specialization to integration, which are the representations of the evolution of "mart" development; on the other hand, it analyzes two internal mechanism of dimensional operation of urbanization economy: internal spatial enlargement mechanism of urbanization economies from monocentric city to multi-center city, and external spatial enhancement mechanism which represents city-regionalization and city-chain connection, the later two mechanism represent the evolution of "polis" development.

这一部分，按照由抽象到具体和由历史到现代的研究方法，分析了市场机制作用下的城市化经济运行机理，从经济学角度提出了农业剩余与比较优势、非农产业、聚集经济、外溢效应四大城市化经济定理；在此基础上，一方面分析了城市化经济运行沿时间增长的两个内在内容提要机制：城市输出产业的城市化经济增长机制和从专业化到综合化的城市性质变迁机制，它们主要表现为&市&发展的延续；另一方面分析了城市化经济运行沿空间增长的两个内在机制：从单中心到多中心的城市化经济运行的内部空间扩展机理和表现为城市区域化、城市连绵体的城市化经济运行的外部空间扩展机理，它们主要表现为&城&发展的延续。

Flowers solitary on long pedicels originating from center of rosette, rarely in few- to several-flowered, ebracteate racemes elongated slightly in fruit.

花单生在长花梗上起源于中心的莲座丛，在很少到数枚花内很少，总状花序在果期拉长稍。

This paper first introduces monocentric urban economic models that illustrate urban spatial structure.

首先介绍了在西方城市经济理论中被广泛接受的单中心城市空间结构静态模型。

Leaves basal or basal and cauline, pedately compound, 3--13-foliolate, rarely simple; central leaflet entire.

叶基生或基生和茎生，鸟足状加重，具小叶，很少单；中心的小叶全缘。

Volar Plate Fixation of AO Type C2 and C3 Distal Radius Fractures, A Single-Center Study of 55 Patients.

掌侧钢板固定AO分型C2及C3型桡骨远端骨折，55例患者的单中心研究

In several single-center studies, PECs have beenshown to have a positive impact.

在一些单中心研究中，已证实了 PECs 的积极作用。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。