在前面

We argue with ourselves over who is the greater sportsman:that figure skater or this skier.There's nothing wrong with this.

这没什么不妥，这对我们有好处，而且不像有些人那么令人尴尬：比如在超市付款处，排在前面的女人告诉收银员，她的侄女梅莉莎星期六可能会来看她。

Rudy at one point said to me, 'Here we have the mayor, the fire commissioner, the chief of the police department, and one of my deputy mayors standing on the front lawn of this house.

鲁迪有一次对我说：'在这里，我们有市长，消防专员，行政的警察部门，其中一个是我的副市长是站在前面的草坪上这个家。

It seemed to be first one, and then the other, then both.

开头像在前面，过后又像在后面，再后来像前后都有。

They carefully read poetry, some in the leg pad of paper, while others lie on his back in front of the students, fear that this operational opportunities exist only fleetingly composition can be inspired by a beautiful poem!

他们认真地写着诗，有的把纸垫在腿上，有的则趴在前面同学的背上，生怕这稍纵即逝的灵感会组成不了一篇美丽的诗歌！

In this article two functional modes of the Fly-back Converter (Continuous Conduct Mode and Discontinuous Conduct Mode) are particularly analyzed, which include their characteristics, applications, the critical pattern of two functional modes is argued, both the exact boundary from the angle of circuit parameters is crystallized, at the same time, basic principle of PFC under the DCM mode is introduced, which settle theoretical basis for the subsequent design; by establishing the mathematic model of the converter, a further investigation of the configuration is made, qualitatively and quantitatively, analyzed to settle exactly theoretical basis for the subsequent emulation and the experimental parameter; from the angle of steady-state analysis, the transfer function of the system is deduced to establish dynamic small-signal state equation, emulating the system with the help of matlab, then according to the simulation result and the theory of PFC revise the system, lastly, we adopt the project which add a zero-pole compensator to the voltage loop, by this way, a satisfied system performance is gained and the PFC scheme is ensured successfully; finally, based on the previously-done work, we combining with the situation of specific design requirement, acquired the numerical value of each unit devices in this converter

详细分析了反激式变换器的两种工作状态，连续模式(Continuous Conduct Mode ，简称CCM)和断续模式(Discontinuous Conduct Mode，简称DCM)以及各自的特点、应用场合，论证了两种工作状态的临界模式，从电路参数的角度明确了二者的界限，同时还介绍了DCM模式下PFC的基本原理，为后面的设计奠定理论基础；通过对整个变换器系统建立准确的数学模型，对此变换器的电路结构做了进一步的研究，定性、定量地分析了变换器各部分的工作状态，为仿真和实验参数的确定以及电路参数的优化提供理论依据；从稳态分析的角度，为系统建立了动态小信号状态方程并推导出系统的传递函数，利用matlab对系统进行仿真，进而根据仿真结果以及PFC的相关理论对系统进行校正，采用在电压环加入零点—极点补偿器的设计方案，得到了满意的系统特性并且保证了PFC的顺利实现；最后，在前面所做工作的基础上，结合设计要求计算出此变换器系统中每个元器件的数值，利用Pspice对其进行了仿真、优化，然后根据仿真结果搭建了硬件电路。

To advertisement reveal an individual to feel 768 15 is below dominant boat had better, additional the GG of home page or what MM cannot put is too much, the individual thinks 3 it is OK to go to 4, the key word of best and different home page increases special number cannot too much, actually individual of key word density thinks is gally you what you should do only is unashamed, caller can experience the station that won't be fed up with you at a draught at least Baidu of course test you also won't give K at a draught to the article publish the result OK and advanced face adds corresponding navigation column to also need not add article title cannot too similar.

对于广告位的展示个人觉得768 15在主导航下面为好，另外首页的GG或者MM不能放的太多，个人认为3到4个就可以，最好不同首页的关键字加上特殊标记不能太多，其实关键字密度个人认为就是吓唬你你只要做的问心无愧，访客能体验到至少不会一下子讨厌你的站吧百度当然考验你也不会一下子就把你给K 对于文章的发表效果可以在前面加上相应的导航栏目也可以不加文章标题不可太相似。

Have a look at the geezer at the front , on the door

看看在前面的那个老头，在门口那个

Precede (L 54): to go in front of sb.; to happen before sth.

走在…前面；在…之前发生

A two-wheeled horse-drawn covered carriage with the driver's seat above and behind the passengers.

有盖的司机的座位在前面且乘客的座位在后面的双轮的马车。

We had long thought of them as a tableau, Miss Emily a slender figure in white in the background, her father a spraddled silhouette in the foreground, his back to her and clutching a horsewhip, the two of them framed by the back-flung front door.

长久以来，我们把这家人一直看做一幅画中的人物：身段苗条、穿着白衣的爱米丽小姐立在背后，她父亲叉开双脚的侧影在前面，背对爱米丽，手执一根马鞭，一扇向后开的前门恰好嵌住了他们俩的身影。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。