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By looking back the history of study on Chinese historicalgeography over 2000 years, this paper points out that thesubject has experienced obviously three stages: thetraditional, the traditional, the ancient time nearest to thepresent and the contemporary. The first, the evolution ofChinese geography was main stream. Second,"geographize"prevailed step by step. Today, the change of environment inhistory is being researched.

回顾二千多年来中国历史地理学的学术发展史，发现这门学科的发展明显经历了以沿革地理学为主体的传统中国历史地理学、&地理化&逐步加强的近代中国历史地理学、&研究历史时期地理环境的变化&的现代中国历史地理学这三个主要阶段。

By looking back the history of study on Chinese historicalgeography over 2000 years, this paperpointsoutthat thesubject has experiencedobviouslythreestages: thetraditional, the traditional, the ancient time nearest tothepresent and the contemporary. Thefirst, theevolutionofChinese geography wasmainstream. Second,"geographize"prevailed step by step. Today, the changeofenvironmentinhistoryisbeingresearched.

回顾二千多年来中国历史地理学的学术发展史，发现这门学科的发展明显经历了以沿革地理学为主体的传统中国历史地理学、&地理化&逐步加强的近代中国历史地理学、&研究历史时期地理环境的变化&的现代中国历史地理学这三个主要阶段。

After the above agent all the hypothesis of the optimization assembly, versus dynamic variance that different the growing period air ratio was studied, the air proportion affecting organisms used in two-step fermentation process and decide the air proportion for different cultivating period and investigate to what extent air may affect the organisms used in two-step fermentation process so that the fair term was created for 2- keto -L- gulonic acid of the accumulation.

在以上因素都优化组合的前提下，对不同生长期空气比的动态变化研究，确定了混合菌培养过程中，根据实际单罐批的生长情况，优化控制空气比可以协调巨大芽孢杆菌﹑氧化葡萄糖酸杆菌之间关系，为2-酮基-L-古龙酸的积累创造良好的条件。

With the development of the national economy of our country, among the hydraulic resources that can be developed in economic developed coastal area and plain area, power stations of high and middle headwater have been developed completely step by step.

随着我国国民经济的发展，在经济发达的沿海地区和平原地区可开发的水力资源中，中高水头电站已逐步开发完毕。

Initiation into Hermetics provides step by step instruction in the form of practical exercises.

起爆到hermetics规定，一步步在教学中使用的形式，实际练习。

The process of adaptation is that body be simulated changed from extreme inadaptation-adaptation step by step and then to the inadaptation again.

IL-2和sIL-2R在长期递增负荷运动过程中，其总体适应特征表现为运动→不适应→逐步适应→再不适应。

Considering the technical requirements,the stability andthe steady performance,the quantitative requirement for sampling frequency is present indiscrete control system.Considering that there is a step delay in discrete control in grid on inverter with a Lfilter,the quantitative relationship between critical FCCR and sampling frequency isanalyzed,and the steady performance is analyzed.Considering the technical requirements,the stability and the steady performance,the quantitative requirement for samplingfrequency is present in discrete control system with a step delay.

在L型并电加热管网中，考虑到离散化控制存在滞后一拍的问题时，本文分析并获得了离散PI控制系统稳定范围时闭环根临界频率fnmax和采样频率fs之间的定量关系；针对存在滞后一拍可能引起系统稳态特性下降的问题，分析了PI控制滞后一拍对频域特性造成的影响，综合考虑并网指标、稳定性要求和离散化对稳态特性影响三个主要因素，推导了存在滞后一拍的离散化PI控制对最低采样频率的量化要求。

It must be carried outthe thought of division of labour,institution and structure,to solve theproblems of enterprise,technology,the policy of industry,market,politicalsystem,etc..Then the people have more intensive disire to be engaged ineconomic activities,there are more intensive organizating efficiency in everyenterprise,every industry and every area,China can cast off the position ofdeveloping country step by step and become the one of the medium-developedcountries.

作为这个思想的落实，必须在企业问题、技术问题、产业政策问题、市场问题、政治体制问题等一系列问题上贯彻分工、制度和结构的思想，使得人们具有较强的从事经济活动的愿望，每个企业、每个产业、每个地区具有更高的组织效率，使得中国逐步摆脱发展中国家的地位，向一个中等发达国家的目标迈进。

Globoidal cam indexing device is one of the new driving devices to carry out high speedand high accuracy indexing motion. It is extensively used in intermissive displacement ofautomatic machine and step-by-step feeding mechanism of automatic line.

弧面凸轮分度机构是实现高速、高精度间歇分度运动的新型传动装置，广泛应用于各种自动机械的间歇转位分度及自动生产线的步进输送机构中。

Through step-by-step grafting, multi-carbon nanotubes with isophorone diisocyanate has been obtained.

本文采用逐步化学接枝的方法，获得了表面接枝有异氰酸酯的多壁碳纳米管。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。