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The scheme makes the DC side of unisolated single PWM rectifier as 350V DC lines. Charger and discharger modules connect to the DC lines. Use this method to charging and discharging single Li-ion battery.

方案将不隔离单相PWM整流器直流侧设计为350V直流母线，通过它与充电模块、放电模块的连接，实现对单体锂离子电池的充放电。

According to capability of the circuit of DC motor, build the model of DC motor; designed the speed-current double closed loop system based on the model of DC motor; analyzed the method to solve the problem of discontinuousness of current.

二、根据直流电机回路，建立电动机的数学模型；针对该电动机模型，选用速度——电流双闭环控制系统，建立双闭环系统的控制方框图；分析晶闸管相控整流方式中出现电流断续现象的解决方法。

It has function of high performance DC pules TIG welding, DC TIG welding and DC manual welding, is a kind of applied machine.

具有高性能直流脉冲TIG焊、直流TIG焊功能，又可直流手弧焊是经济实用性机型

In the paper the author disagrees to introduce DB in China and compares the advantages and disadvantages of both DB and DC plan, and discusses lessons of DB pension plans in Anglo-American economies, DC scheme's trend in the world and its comparative advantages for the competitiveness of Chinese enterprises, effects of DB and DC on economic outcome and social development, and development paths in countries with different juristic systems. Finally, this paper suggests measures for recompensing the older employees of their rights in occupational pension.

文章对DC和DB两个模式进行了优劣比较，分析了英美DB型企业年金模式的沉痛教训，论述了DC型的优势和发展潮流及其对中国提升企业竞争力的利处，以及它们各自对经济结果和社会发展的不同影响，阐述了不同国家继受不同法系导致的不同发展道路和中国发展企业年金应该努力的制度方向，进而分析了中国公共政策的制定过程中的博弈问题；提出了补偿老年职工企业年金权益的设想和具体办法。

In order to study diesel locomotive AC-DC electric-drive system, this thesis makes a analysis of the primary capability parameters of AC-DC electric-drive system, under the train"s running state, such as traction dynamotor"s voltage/ current, pulling power and train velocity, then makes a research in the ideal running characteristic and the adjust characteristic of dynamotor and the speed adjust characteristic of electromotor with the theory of AC-DC electric-drive.

本文针对内燃机车交-直电力传动系统，对机车运行过程中，传动系统的主要性能指标参数(如牵引发电机电压/电流、牵引力、机车速度等)及其关系进行分析；并运用交-直电力传动原理，对机车电力传动过程中牵引发电机的理想外特性、调整特性及牵引电动机的速度调节特性进行研究；通过参考东风7型内燃机车的性能、结构参数，运用Visual Basic对内燃机车交-直电力传动系统进行数学建模。

It is reported, verus platform contains 4 to joy stick, have on enter, begin, regressive, switch on the mobile phone, restart, be in a poor light / close wait for key-press, and portable memory CF gets stuck, can insert equipment to choose miniature hard disk, adapter of the DC power supply that still contains DC 5v, 2.5a additionally, AC-DC and agency equipment, will undertake data-base applies change and making the movie.

据悉，Verus平台带有一个四向把持杆，上有进入、起头、退却退却、开机、重启、背光开/关等按键，以及可挪动存储CF卡，并可拔出备选微型硬盘，此外还带有DC 5v 、2.5a的DC电源、AC-DC适配器以及前言行动措施等，来进行转化和生成片子资料库应用。

Introduced the analysis and processing of a transformer with three-phase winding of DC resistance imbalanced defect,through further analysis of the after processed DC resistance,believed the transformer still existing the polarity selector"-" side contact deficiency,further on finding out the method of comparing corresponding DC resistance difference rate at each tap has the advantage to detect the polarity selector defect more accurately more sensitively and more directly.

对一台变压器出现三相绕组直流电阻不平衡缺陷的分析和处理情况做了介绍；通过对处理后直流电阻的进一步分析认为，该变压器还存在极性选择开关&－&向侧仍有接触不良方面的缺陷，遂进一步提出，如采用比较各对应分接位置下直流电阻差率的方法能够有更准确、灵敏、直接地发现极性选择器方面缺陷的优点；还提出了测试变压器绕组直流电阻时的几点注意事项。

This paper proposes a switched-mode boost DC-DC converter, which doesn't need not only a saw-tooth wave generator but also an error amplifier. By using a comparator and a fixed duty-cycle oscillator, the proposed controller will offer a high DC voltage of 15V to drive the LED backlight driver for Liquid Crystal Display.

中文摘要本论文提出ㄧ种不需锯齿波产生器和误差放大器的架构，其系利用比较器和输出固定责任比的振荡器来替代锯齿波讯号，藉此控制开关的动作，完成升压式直流电压控制晶片，以提供15伏特直流偏压给小尺寸液晶显示器(Liquid Crystal Display， LCD)。

A recent seminar on Pentecostalism put on by the Council on Foreign Relations in Washington, DC, attracted people from the entire Washington political machine, including the National Security Council, the vice-president's office, the World Bank and the International Monetary Fund.

外交关系委员会最近在华盛顿特区举办的有关五旬节派信仰的一次讨论会吸引了来自整个华府政治机构的人员，包括国家安全会议、副总统办公室、世界银行以及国际货币基金组织。

Technological tools,hotel guests used to rely on the concierge at their desionation to orient them to their new surroundings and connect them with tourist destinations,specialized shopping,gourmet restaurants,business services and serve a myriad other needs,twenty years ago.when i first started as a concierge in Washington., DC,concierges developed huge Rolodexes of contacts locally,nationally and internationally,in order to answer every request for help.we kept huge libraries of resources at our desks,telephone books,atlases,five inch thick guides to hotels around the world,a dictionary,and fight schedules for national and international travel,restaurant guides,an incredible amount of brochures on local attractions and so on.almost all of which are now replaced by computer access Back then,when a new challenge was made to a concierge, it could sometimes take hours of telephone calls to research an answer, as the chef concierge at the Park Hyatt Washington during the early 1990's,I remember getting a request from a VIP guest from the Middle East.

以前，宾客抵达目的地后，要靠礼宾员带路才能到达自己的下榻之地，并需要礼宾员指明旅游景点、专卖店、美食餐馆、商务服务以及其它各种需求。二十年前，当我第一次在华盛顿特区从事礼宾职业时，礼宾员需要收集大量本地、全国及国际联系人的名片，以便回答宾客提出的各种请求。我们的办公桌上堆满了各种参考资源，例如电话簿、地图册、五英寸厚的全球酒店指南、词典、全国和国际旅行的航班时刻表、餐馆指南，还有大量本地风景名胜的手册，等等。但现在，这些东西都已经被电脑取代。以前，如果礼宾员遇到新的问题，可能需要打几个小时的电话才能找到答案。20世纪90年代，我在华盛顿柏悦酒店担任礼宾领班，我记得有一个中东来的VIP贵宾向我提出了一个请求。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？