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After take analyzed deeply for the opened magnet circuit with FEMM (Finite Element Method Magnetics) we find out the field distributing that is separated into three sections . One is the main area what we called as positive field section. Beside the main field there are tow areas that are called the inverted field sections. Loudspeaker arise a very serious distortion when the voice coil moving into inverted field areas. The direction of induced current in the coil part of entered inverted field area is same with the current driving into loudspeaker so that total currents increas largely and heat increase rapidly. With more coils moving into inverted area the voice coil will take on negative inductance properties. It is the main reason that voice coil is burned by heating with increasing current due to arise negative inductance. So opened magnetic circuit is not suitable for the woofers in which the voice coil have wider displacement range. When using this kind magnetic circuit design, the voice coil moving range should be less than the range of positive field to avoid loudspeaker arise serious distortion and heating. Even though voice coil moving range is in the positive area, loudspeaker will still arise more distortion because the field distribution is very cliffy at tow sides of the positive area and full range of magnetic field distribution is not parallel that will arise distortion. Base on above reasons, opened magnetic circuit is not an ideal magnetic circuit for low-frequency loudspeakers. But it can be used in mid-range or high-frequency productions.

开式磁路是由2片钕铁硼磁铁和主导磁板和导磁垫片组成，我们在实践过程中发现这种磁路结构不适合于低频扬声器的使用，我们通过使用FEMM（Finite Element Method Magnetics）软件包对该磁路进行了分析，该磁路的磁场范围被分成3个区域，其中在主导磁板附近形成一个正向磁场，在正向磁场的两边存在反向的磁场，音圈在工作时有很大一部分进入了反向磁场中，在反向磁场内线圈的感应电流方向与驱动电流方向相同，使得音圈呈现出负感抗特性，由于音圈的负感抗特性引起电流的增加导致音圈发热甚至烧毁，因此在扬声器中使用开式磁路时，音圈的运动范围应控制在正向磁场范围之内，否则音圈运动到反向磁场区域时将会产生很大的失真和发热，即使在设计时已经将音圈的运动范围控制在正向磁场范围之内，由于正向磁场的2个边缘磁场强度衰减太快，同时开式磁路中磁场的分布不是平行的，而是自由发散的分布，这样肯定会导致扬声器的非线性失真，因此我们得到的结论是：开式磁路并不是一个理想的磁路，它不适合于低频扬声器的使用，但它还可以应用于中高频扬声器。

The opened magnetic circuit is composed as tow NdFeB permanent magnets and a top plate without U-yoke. After take analyzed deeply for the opened magnet circuit with FEMM (Finite Element Method Magnetics) we find out the field distributing that is separated into three sections . One is the main area what we called as positive field section. Beside the main field there are tow areas that are called the inverted field sections. Loudspeaker arise a very serious distortion when the voice coil moving into inverted field areas. The direction of induced current in the coil part of entered inverted field area is same with the current driving into loudspeaker so that total currents increas largely and heat increase rapidly. With more coils moving into inverted area the voice coil will take on negative inductance properties. It is the main reason that voice coil is burned by heating with increasing current due to arise negative inductance. So opened magnetic circuit is not suitable for the woofers in which the voice coil have wider displacement range. When using this kind magnetic circuit design, the voice coil moving range should be less than the range of positive field to avoid loudspeaker arise serious distortion and heating. Even though voice coil moving range is in the positive area, loudspeaker will still arise more distortion because the field distribution is very cliffy at tow sides of the positive area and full range of magnetic field distribution is not parallel that will arise distortion. Base on above reasons, opened magnetic circuit is not an ideal magnetic circuit for low-frequency loudspeakers. But it can be used in mid-range or high-frequency productions.

开式磁路是由2片钕铁硼磁铁和主导磁板和导磁垫片组成，我们在实践过程中发现这种磁路结构不适合于低频扬声器的使用，我们通过使用FEMM（Finite Element Method Magnetics）软件包对该磁路进行了分析，该磁路的磁场范围被分成3个区域，其中在主导磁板附近形成一个正向磁场，在正向磁场的两边存在反向的磁场，音圈在工作时有很大一部分进入了反向磁场中，在反向磁场内线圈的感应电流方向与驱动电流方向相同，使得音圈呈现出负感抗特性，由于音圈的负感抗特性引起电流的增加导致音圈发热甚至烧毁，因此在扬声器中使用开式磁路时，音圈的运动范围应控制在正向磁场范围之内，否则音圈运动到反向磁场区域时将会产生很大的失真和发热，即使在设计时已经将音圈的运动范围控制在正向磁场范围之内，由于正向磁场的2个边缘磁场强度衰减太快，同时开式磁路中磁场的分布不是平行的，而是自由发散的分布，这样肯定会导致扬声器的非线性失真，因此我们得到的结论是：开式磁路并不是一个理想的磁路，它不适合于低频扬声器的使用，但它还可以应用于中高频扬声器。

One of the most common ways to describe a wood's tonal properties is in terms of its frequency range,which is often broken down into low-end frequencies,mid-range and high-end frequencies.picture it as a visual spectrum,as we've done in the chart to the right,with the lower frequencies on the left and the higher frequen-cies on the right.the graph line for each wood visually depicts its general tonal range.rosewood and ovang kol,for example,tend to resonate with more low-end frequencies,whereas koa,cocobolo and maple tend to sound brighter from having more top-end frequencies.note also rosewood's"scooped"midrange and ovang-kol's fuller midrange.the doted lines for walnut and koa denote the expansion of low-end frequency range as the guitar opens up after a period of playing it.

最常见的方式描述了木材的声音特性是在其频率范围内，这往往是细分为低端频率，中端和高端frequencies.picture它作为一个视觉频谱，因为我们'维生素E这样做的图表，以权，以较低的频率在左边和更高的频率，种上right.the图线的每一个木材视觉描绘的一般音调range.rosewood和ovang科尔举例来说，往往会产生共鸣更多的低端频率，而兴亚， cocobolo和枫树往往从健全光明有更多的高端frequencies.note也花梨木的&收购&的中端和ovang -科尔的充分midrange.the doted线的核桃和兴亚指扩大低端频率范围内的吉他开辟了一段时间后，打它。

Lawrence River in mid-January 2010. This image, taken by the Moderate Resolution Imaging Spectroradiometer on NASA's Aqua satellite on January 17, shows the mouth of the river.

这张图片由美国宇航局的阿卡卫星上的中等分辨率成像光谱仪拍摄于1月17号，向人们展示了圣劳伦斯河的河口。

The Youth Concern Group on Drug Testing Scheme in Taipo conducted a questionnaire survey on the school drug test scheme in mid-September. They successfully elicited responses from 978 Form One to Form Seven students from 22 schools in the district.

青少年「关注大埔区校园验毒试验计划」小组在9月中以问卷形式，成功访问大埔区22间中学共978名中一至中七学生，了解其对大埔区校园验毒计划的意见。

In his classical works On Grain Taxes , Lenin Pointed out that National capitalism was the mid-link transited from small produce to socialism; elaborated the defination, nature and forms of national capitalism, and affirmed its progress fully standing on the height of his toric materialism; generally, Lenin treat national capitalism properly with the dialectical attitude.

列宁在《论粮食税》这一经典著作中，指明国家资本主义是从小生产过渡到社会主义的中间环节，阐述了国家资本主义的概念、性质、形式等；站在历史唯物主义的高度，充分肯定了国家资本主义的进步作用；以辩证唯物主义的态度，正确对待国家资本主义。

The ball exhibition abducts many years, has the mid heaven to pass warmly unfolds, the character lives at unfolds and so on, and business leaves many times adds the building Mountain,petroleum,materials, to pass, the hardware warmly and so on each line of well-known exhibitions.

环球励华展览举办国内外展会多年，举办有中国国际空调暖通展，中国数字家居展等，并组织中国企业多次出国参加矿山、石油、建材、暖通、五金等各行业国际知名展会。

I have had ever chatting with people, who is a man, to the mind night of 3 or even 4 o'clock., but we still want to keep on. I don't feel a little bit tired, even I accompany you to work to mid night. As long as seeing you, I feel happy and beatific. To hold your hand is always my thought and dream, even though it looks as sister holds her brother's hand, but just so I still feel the happiness. It is my hope that your former girl friend can appear in front of you, as you will be feeing felicity. I thirst for lieing on the beach with you eagerly . I don't know how about myself, maybe it is that I am grown-up already.

我从来没有试过跟一个人而且是一个男人聊天到凌晨三四点还想要继续下去，陪着你工作到午夜一点儿也不会觉得累，只要看着你，我就觉得幸福，好想好想试着去拉你的手，那怕就像是妹妹牵着哥哥一样我也会觉得好幸福了，好希望你的前女友出现在你的面前，那样可能你就会觉得幸福了，好想跟你一起躺在沙滩上，我不知道自己是怎么啦，可能是长大了，有些东西出现了。

In most of BG's recent reports, there is always the mention of since Beijing relaxed its policy on issuing New licenses to Big Motorcycles since 2007 and Shanghai has follow suit in 2009, The impact of this New policies can now be seen in many places in Beijing and Shanghai, not to mentioned the dramatic increase of bike sales for Harley and BMW as people is now willing to dish out the price of nearly 2 or even 3 China made Mid size family saloon cars to get a Harley or BMW as now they can openly ride on most Beijing and Shanghai streets without having to play hide and seek with the traffic police whenever they get closer to the city center.

在BG最近的许多报道中都有提到北京在2008年放宽了大排量摩托车申请上牌的政策，和2009年上海也出台了相同的政策，现在，在北京和上海许多地方都可以看到这项新政策所产生的影响。首先值得一提的是哈雷和宝马摩托车销售量的显著增长，现在许多人愿意拿出2-3台中型国产中型轿车的钱来买一台哈雷或是宝马摩托车，因为他们现在可以在北京和上海的大部分市区合法驾驶摩托车，而不需要像以前一样在接近市中心的地方跟交警捉迷藏。

He also advised the team on their transition from grooved to slick tyres in preparation for the new season, his first two world titles having come on slicks back in the mid-1990s.

他还在新赛季使用光头胎给出了许多建议。他的头两个世界冠军就是在90年代中期采用光头胎规则下获得的。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。