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This article first on to the topic background, the topic object basic survey and the topic research goal has given brief showing, then has made a detailed elaboration to the AC-DC-AC inversion principle of work, emphatically has analyzed based on the AC-DC-AC inversion control principle as well as the SPWM profile several productions method.

本文首先就对课题的背景，课题对象的基本概况以及课题研究的目的做了简要的说明，然后对AC-DC-AC逆变器的工作原理做了一个详细阐述，着重分析了基于AC-DC-AC逆变器的控制原理以及SPWM波形的几种生成方法。

The ionizer as a tool to counteract the affect of urbanization on our water has become more and more essential as time has passed and the condition of our water has decreased.

该ionizer作为一种工具来抵消影响城市化对我们的水已经变得越来越重要，时机已经过去了，我们的条件，水已经减少。

The main research methods are:(1)Theory analysis:from the 2D plane geometry analysis, dots continuity characteristics are found. The first time irrational fraction algorithm is used in FM program.(2)Experiments reaearch:experiments of condition halftone function are designed under the cross-experiment principles. The first time variable information printer and C# language are used in experiment.(3)Data processing:new type digital density apparatus is used to measure data. Compare is used in processing data and error cause are explained. The main works as follows:The dot area percentage has been gained and new condition halftone function has been set up.(2)After being corrected, speed of irrational fraction algorithm has been compared with multiplicative congruence algorithm's.

本文的主要研究方法有：(1)理论分析：运用数字加网原理，从二维平面几何分析入手，借助实验验证研究网点连续特性；首次系统地把无理数取尾法随机数生成器引入到调频加网系统中，根据实验修正生成器的模型，运用统计假设检验理论，对生成的随机数序列进行统计假设检验；(2)实验研究：根据正交实验法则设计实验，首次采用可变信息印刷机(HP Laser PS印刷机)输出实验样张，克服了用传统胶印机作实验影响因素多的缺陷；采用新型数字式密度仪测量密度值，提高了数据精度；采用最新编程语言编写调频加网程序；(3)数据处理与分析：利用平均值比较法处理数据，对误差产生的原因进行讨论。

Summary: A kind of irrigator applying to arbors in city virescence belts was studied, which has a great capacity and has no effect on scenery because it was buried round the roots of trees. It also has a lot of characters such as the filtration of water resource is undemanding, the seepage of water completely depends on gravity, the working stress of transporting water is low and so on..

本文研究了一种应用于城市绿化带乔木的地下渗灌装置，它具有容量大，埋设于树木根区土壤中不影响地面景观，对水源过滤要求低，完全依靠重力渗灌，输水工作压力低等特点。

If she has an annoying regional accent, uses incorrect grammar, has a limited vocabulary, and if she has an irritatingly sharp piercing voice, sounds whiny or bossy or doesn't articulate her words clearly, it' s an immediate turn-off.

如果她有严重的地方口音、语法错漏百出、词汇量有限，如果她声音刺耳，听起来像与人抱怨或发号施令或者吐字不清，就会立即引起人的反感。

If she has an annoying regional accent, uses incorrect grammar, has a limited vocabulary, and if she has an irritatingly sharp piercing voice, sounds whiny or bossy or doesn't articulate her words clearly, it' s an immediate turn- of f.

如果她有严重的地方口音、语法错漏百出、词汇量有限，如果她声音刺耳，听起来像与人抱怨或发号施令或者吐字不清，就会立即引起人的反感。

To facilitate the restoration and recovery of reef ecosystems and to protect the marine resources, the government of Taiwan ROC has designated Dongsha Atoll as a marine national park in March 2004. The area encircled by 100 m isobath has been designated as the protected zone and the area encircled by 12 miles from the edge of the atoll has been declared as the general control zone.

为了保护东沙环礁的生物资源及促进环礁生态系的复原，政府已於2004年3月通过设立东沙国家海洋公园，预定将环礁外围100公尺等深线之内的范围划设为海洋生态保护区，此界限至环礁外围12里为一般管制区。

Longitudinal reinforcement has been modeled with discrete element and stirrup has been modeled with smeared element. Smeared element, stirrup has been modeled using membrane element in or on concrete isoperimetric element. The constitutive relationship and failure criterion for concrete is the inter-facial model.

在建立钢筋混凝土的有限元模型时，混凝土采用的单元为八节点六面体等参单元，钢筋单元分为两种情况，纵向钢筋采用分离式钢筋单元，箍筋采用埋藏式钢筋单元，即箍筋作为附着在混凝土等参数单元内或单元上的"膜单元"。

The superstructure has used the model of elastical constitutive relation; the pile-group foundation has quoted the soil-pile equivalent compound model. It has been analyzed the constitutive relation for soil-pile equivalent compound which regarded as the transversely isotropic body this construction relations, and determined the corresponding elastic constant.

上部结构采用线弹性本构模型，下部群桩基础引用了桩土等效复合体模型，分析了将桩土等效复合体视为横观各向同性体的本构关系，确定了相应的弹性常数。

Although some problems arose in the implementation of cooperative medical system such as malpractice and jobbery of cadres at the grassroots level and unlicensed doctors, the defects can't obscure the virtues:from the standpoint of life expectancy and infant mortality rate,the former has risen from 35 in 1949 to 68 in 1982 and the latter has dropped from 200%to20-30%,which speaks for itself that rural medical system during the collectivist period has gained remarkable achievements.

中国"在落后国家的经济水平上达到了先进国家的卫生水平"，取得"低收入发展中国家举世无双的成就"，并成为"发展中国家解决卫生经费的惟一范例"。1980年代初，农村经济体制改革对合作医疗制度与赤脚医生队伍造成的冲击使农村医疗卫生制度改革势在必行。

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。