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It consists of circuitry that this constant current circuit stabilizes the criteria of a highly precise returned type constant current circuit of operation in another constant current circuit,Furthermore, the voltage amplification with very high stability is realized by adopting this constant current circuit also as the bias circuit of a first rank cascode and the 2nd step cascode, and the 2nd step constant current load intensity.

它由电路，这恒流电路稳定的标准，一个高度精确的返回式恒流电路的运行在另一恒流电路，此外，电压放大具有极高的稳定性，实现了通过这项恒流电路也作为偏见电路的第一级和第二栅栅一步，和第二步骤恒定电流负荷强度。

Later, it makes some comparison with four kinds of modulation technique, and finally, it implements the three-level PWM switching power amplifier with the PWM technique. The power of the amplifier is 2kVA, and the frequency bandwidth is 10～3kHz. In the thesis, the author designs and makes the hardwares of the switching power amplifier. The hardwares contain power inverter rank circuit, control system circuit based on DSP, drive and isolation circuit, and protective circuit. The thesis also analyses the potential safety problems and put forward some solutions for the problems. Furthermore, the thesis accomplishes the software design of the control system, and successfully debugs it. The methods of designing higher power ampilfier are also discussed in the thesis. It analyses the feasibility of the methods, outlines the way of how to design higher power switching power amplifier, and does some experiments with the method of switches-parallelling.

根据电动振动试验系统对开关功放的要求，提出了以电感电流瞬时值控制技术为基础的三电平脉宽调制开关功放的设计方案，并通过系统仿真进行了原理性论证；然后设计并制作了开关功放的硬件，包括功率转换电路，基于DSP的控制电路，驱动、隔离电路以及保护电路；针对开关功放数学模型不易得出的特点，细致分析了模糊自适应PID控制方法，在此基础上编写了控制程序；研制出一台功率为2kVA，通频带为10～3kHz的三电平脉宽调制开关功放；论文中还探讨了实现大功率开关功放的方法，分析了各种方法的可行性，给出了实现大功率开关功放的思路，并进行了并联开关管实现大功率开关功放的实验。

He entered his novitiate to the true wilderness with Sam beside him as he had begun his apprenticeship in miniature to manhood after the rabbits and such with Sam beside him, the two of them wrapped in the damp, warm, negro-rank quilt while the wilderness closed behind his entrance as it had opened momentarily to accept him, opening before his advancement as it closed behind his progress, no fixed path the wagon followed but a channel nonexistent ten years ahead of it and ceasing to exist ten yards after it had passed, the wagon progressing not by its own volition but by attrition of their intact yet fluid circumambience, drowsing, earless, almost lightless.44

孩子就这样进入了熟悉真正的荒野生活的见习阶段，有山姆在他身边，正如他小时候追捕兔子这类小动物度过雏形的见习时期，山姆也陪伴在他身边，这时两人裹在湿漉漉、暖烘烘、散发出黑人臭味的被子里，方才暂时对他开放来接纳他的荒野在他身后合拢了，森林在他前进之前开放，在他前进之后关闭，大车也没有固定的路可走，只有一条仅仅看得清前面十码路的通道，大车走过十码后，这段路也就湮没，这大车并没有按自己的意志往前行进，而是由人和大车所造成的纯净的气流浮托着在往前滚动，大车在打瞌睡，听不见一点声音，也几乎见不到一点光线。45

The first rank whole city appoint clerical edition advocate Yong Jingyuan is resided appoint clerical Zhang Jie says, network platform knows company condition like us popular wishes, solve a dweller to appeal to beg, feel network public feelings " nerve ending ".

全市第一位居委书记版主雍景苑居委书记张洁说，网络平台就像我们了解社情民意、解决居民诉求、感知网络舆情的"神经末梢"。

Next time is added achieve content formerly, increased in-house connection, the station that looked for a few friends made the exterior connection of a few weight having a place, spent 2 weeks so, this word of new happy city ranks the 31st page from Baidu, promoted the 9th page abruptly, although still do not have the first page, but look at a rank rise, bright still compares in the heart.

然后的时间就加原创内容，增加了内部连接，找了几个朋友的站做了几个有点权重的外部连接，这样过了2个星期，新乐市这个词从百度排名第31页，猛然提升到了第9页，虽然还没到第一页，但看着排名的提高，心里还是比较爽的。

"TODAY is a day that will rank with the day we passed the Civil Rights Act in 1964!"

来自密西根的民主党议员约翰·丁格尔如此宣布"今天这个日子与我们在1964年通过民权法的那天同样重大！"

In some areas, the school authority gives less significance to the subject reformation including arts. There are a lot of problems existing not only in limited class frequency, teaching resources and latest information, but also in poor salary, low rank of teaching faculty, low scientific and research level of art and new course training have not received a good result. Under this circumstance, the development of basic art education has been badly affected, and at the same time, the quality of human's foil and harmonious development has been destroyed.

由于甘肃经济条件的制约以及长期以来形成的教育观念的问题，在基础美术教育阶段，有些地区学校领导对课程改革和美术学科其重要性认识不够，美术开课率不足、不齐、美术教学资源缺乏、美术教育信息闭塞、美术教师待遇、职称落后，美术科研水平偏低，美术新课程培训形式化，这使得美术教师的教学信念不强，工作热情减低，学生学习的积极性也不够，这些问题的存在严重影响了甘肃省基础美术教育可持续发展，影响了人的全面和谐发展的素质教育要求。

Or even what good grades and our class rank can mean to us.

甚至高分和在班里的排名对我们意味着什么，他们也不明白。

He analyse Baidu is to the rank of key word of a site from what when undertake integrated whole gives a mark as follows, this is absolutely oneself guess, however the fact of before a lot of popular key word are ranked 3, good claver did not say more, we enter subject below.

本人分析百度对一个站点要害字的排名是从如下几点来进行综合整体评分的，这绝对本人的猜测，而是很多热门要害字排名前三的事实，好了闲话不多说了，下面我们进入正题。

General manager liao changrong hopes that the new factory would be a good opportunity for clemente, with its competitive advantage, in the market. and he also expects clement brand can rank among top five in the industry within the following three to five years.

总经理廖昌荣希望能以新工厂落成为契机，继续保持克莱门特优良的竞争优势，在未来三到五年的时间里，克莱门特品牌能跻身行业前五强。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。