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Based on the present conditions in this field all over the world, this dissertation detailedly analysed the working process of the reversible direct current PWM controlled by double poles bridge, and illustrated the merits and shortcomings of the direct current PWM system.

本文针对国内外在这一领域的研究现状，详细分析了双极式控制的桥式可逆直流脉宽调速系统的工作过程，以及直流PWM系统的原理和优缺点。

This year, we intend to raise some chicken in our care center, so we need to build a henhouse, a garden and a sand trap under existing conditions. Today is Friday, after class, we ask our children to do what they can do. Everyone here loves working and that day they all worked with great enthusiasm. I have full confidence that our yard will become more and more beautiful and the children will have a safer and better place to play on in the future.

今年我们打算在关爱中心养鸡，所以就要搭一个鸡窝，还要建一个花坛，利用现有的条件做一个沙坑，今天是星期五，孩子们放学后就让他们帮助做一些力所能及的事情，他们一个个干的热火朝天，都是很喜欢劳动的孩子，我相信，我们这里会变得越来越漂亮，孩子们也会有更好更安全的活动场所。

It is also important to keep a policy of long-term partnership, as well as offering proper prices and conditions and signing a contract of exclusivity of supply for the Brazilian marketplace between your company and KN Waagen. It follows some information about our company in order that you can get to know us better: KN WAAGEN has been working in the Brazilian marketplace in the weighing sector for over 12 years. Our construction basis is supported on over 20 years experience with products Sartorius A.G – Germany.

如果需要，这可以作为维持长期伙伴关系的一个条款，报价和条件你们公司和KN Waagen将签署一个针对巴西市场的非专有性供应合同接下来是一些关于我们公司的信息，便于你们能够更好的了解我们 KN Waagen已经在巴西市场上重量领域经营12年多了我们有着20多年为德国制造Sartorius A.G的丰富经验为构架基础。

It bases on engineering thermal calculation, uses the extensive applicable formularies, sufficiently considers the characteristics of working substances and system components in variation work conditions, uses more exactly sectionalize fitting equations.

本仿真模型建立在工程热力计算方法的基础上，采用工程中广泛应用的计算公式；充分考虑在变工况时各种工质物性和系统部件特性的变化，采用更精确的分段拟合公式。

This thesis,starting from working out the arrest points and the infl ection points of the function curves of the grey mathema tical model GM(1:1 )and its residual correction model and residual period model, derives the conditions for empliying these grey models to obtain a higher class of accuracy,thus enabling the user to decide which model should be used in the light of the state of given initial sequency data.

从求得灰色数学模型GM(1.1)及其残差指数修正模型和残差周期修正模型函数曲线的驻点与拐点入手，导出使用这些灰色模型取得较高精度的条件，让使用者可依据初始序列数据的态势决定采用哪种数学模型，并且在结果未揭示以前便可大体上估计到拟合精度是否令人满意。

Ship-handling simulators are designed on the basis of computer technologies, the hydro-dynamics, ship's manoeuvrability, etc,, to simulate the working and controlling of all types of the ship in various conditions.

摘要船舶操纵模拟器系统是以计算机技术为主，结合船舶水动力学等学科，模拟各种海区和海况、各种类型船舶及其控制系统，达到模拟仿真训练的目的。

BEIJING - A factory boss and nine foremen have been arrested in eastern China after the police raided a brick kiln late last month and found 32 mentally disabled people working in what were described as slavelike conditions, according to the state-run news media.

北京--据国家媒体消息，上个月晚些时候，在中国东部某地，警察冲进一个砖窑解救了32个智障工人，他们的工作环境被描述为像奴隶一样的工作条件，警察同时逮捕了工厂主和九个工头。

Based on analysis of transport mode of the upper working module structure and design condition of the additional slideway structure of Nanyou marine wharf in Zhanjiang City, critical problems in design process were solved and favorable conditions were created for successful completion of the additional slideway project.

对湛江市南油海工码头加建滑道工程上部工作模块出运方式、设计条件的分析，解决设计过程中关键问题，为加建滑道工程顺利建成创造条件。

The working voltages were experimentally measured on-line at different reaction times under conditions of different temperatures, different current densities, and different initial anolyte concentrations in the electrochemical synthesis process of sodium dichromate and chromic anhydride from sodium chromate and sodium dichromate, respectively.

在线实验测得不同温度、不同电流密度、阳极液不同初始浓度时，铬酸钠电催化合成重铬酸钠和重铬酸钠电催化合成铬酸酐过程中不同反应时间下的工作电压。

The experimental conditions for measurement on the content of aluminium, calcium, magnesium, manganese, phosphor, silicon and titanium using ICP-AES method according to GB/T6730.63—2006 have been tested and analyzed. In the experiments the iron ore sample is decomposed and extracted using sodium carbonate/sodium tetraborate with proper acidity as the flux and then a working curve is drawn up using extremely pure ferric oxide (F2O3) as the primitive. And in the end the correlation coefficient r attains to 0.999 and above.

试验ICP-AES法测定铁矿石中铝、钙、镁、锰、磷、硅和钛国家标准方法GB/T6730.63－2006的实验条件，用碳酸钠/四硼酸钠作熔剂分解铁矿石样品，适当的酸度浸取，以高纯三氧化二铁打底作工作曲线，相关系数r达0.999以上。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。