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With the help of comparison theorem, sufficient conditions which guarantee permanence of the system are obtained. For the almost periodic case, by constructing a suitable Liapunov function, we obtained that the system has a unique globally asymptotically stable positive almost periodic solution. Finally, we study a multispecies predator-prey system with stage structure and Holling II type functional response.
第二部分考虑具有阶段结构的非自治扩散捕食系统,利用比较定理得到该系统持久生存的充分条件,其后在概周期情形下通过构造合适的Liapunov函数得到了保证该系统存在唯一一个全局渐近稳定的概周期解的条件。
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The foundation of this system provides a good reference to promote the standardization and intelligence of the overhaul and maintenance of vacuum switches. This paper develops a special HF pulse power supply for internal pressure estimation, which achieves the output of HF-HV sinusoidal pulse wave whose frequency and amplitude can be modified respectively, and meets the design requirements according to the results of Simulink simulation and practical experiments. With the help of AT89S52, this paper designs an I~2C serial bus based signal detection system for peak value signal acquisition of HF pulse currents, which communicates with the upper computer by asynchronous serial communication for uploading the data. In the upper computer, a human computer interface is developed by Matlab software, whose functions are to do some computation and graphic display, such as calibrating the relation curve of vacuum degree and peak value of HF pulse currents, vacuum degree computation, and vacuum lifetime evaluation analysis basing on grey forecasting model as well as making relative suggestions.
本文研制了用于真空度检测的高频脉冲电源,通过Simulink仿真和试验检验其满足设计要求,实现了电压幅值和频率独立可调的正弦波高频高压脉冲输出;利用以AT89S52为核心基于I~2C串行总线的信号检测系统实现高频脉冲电流峰值信号的采集,通过异步串行通信实现单片机与计算机之间的数据通信,将检测数据传至上位机;在上位机利用Matlab开发人机交互界面,实现相关数据处理和图形显示,包括真空度——高频脉冲电流峰值关系曲线标定、真空度数值计算、基于灰色预测模型的真空寿命评估分析和提出相应决策建议。
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Chapter two discusses the appearing, the developing and the changing of athanasia in the mentioned three works comparatively, with help of the author\'s viewpoint of athanasia and draws the conclusion that the author\'s three works reflect oriental culture as well as Russian culture with obvious religious tendency.
第二章结合作者的"永生"观,用比较的方法论述了"永生"主题在上述三部作品中的出现、发展和变化,认为其中既有东方文化色彩,又体现出俄罗斯文化传统,同时有明显的宗教倾向。
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To help you further in the preparation of your paper, you should read the relevant chapter from Karl Galinsky, Augustan Culture (1996), which will provide you with a second opinion with which to compare Zanker.
为了进一步准备论文,你应该阅读Karl Galinsky的《奥古斯都文化》(1996)的相关章节,书中提出另一种观点和Zanker的观点对比。
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As the leader and the innovator of the China inspection, identification, testing and certification services, we provide final solutions authoritatively, we have perfect global service network and excellent service concepts, with the help of our leading technologies and advanced testing equipments, customers can take a leading position in the international market, the most crucial is that we have the ability to become partners with our customers.
作为中国检验、鉴定、测试和认证服务的领跑者和创新者,我们以提供权威性的最终解决方案,以完善的全球服务网络和卓越的服务理念,通过我们领先的技术和先进的测试设备,帮助客户在国际市场占得先机,最关键的是,我们有能力与客户成为合作伙伴!
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With the development of IT,the IT intra-industry will have higher demand about the software quality.this will absolutely attach importance to test of software.with the IT research and development and instrument,accompanying software engneering and software engneering practices further promotion,software test will be gotten more attention and specialized.the instruments will increase the progress of test,also can put the control and administration into the process of test.under the help of funtional test of data-driven of automatic test intruments,we can increase the coverage of the test,also can save more time and capital for corporations.because of continuous improvement of the process of software development,the continuous software integraton and automation of software test will be absolutely inevitable,also have more and more effects.different technology and research and development circumstances will have different requirements about how to automatize,so it hase more space deserved to research.
随着信息技术的不段发展,行业内对软件的质量要求越来越高,这必然引起对测试工作的重视,随着软件开发技术和工具的提高,软件工程和软件工程实践的推广,软件测试日益得到重视和专业化。工具能够加快测试的进度,可以把控制和管理引入整个测试过程。通过对自动化测试工具的数据驱动来进行功能性的测试,可以提高测试的覆盖率,并且可以为企业节省大量的时间和资金。因为软件开发过程的持续改进,软件项目的持续集成与测试自动化的发展是必然的,其作用也将越来越明显。不同的技术和开发环境对测试如何自动化有不同的要求,所以还有很多值得研究的地方。
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The method of establishing the constraints with the help of coordinate axis system coincidence is put forward and verified by the automatic assembly of panels with an automatic drilling and riveting machine.
提出采用坐标轴系统重合的约束方法,以自动钻铆机床和壁板的自动装配为实例验证。
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Go up first 2 when, attend Chinese class one day, came an exercitation teacher, at that time sit last me, from the back also sit with respect to my person, when beautiful female teacher turns around to write on blackboard, I see she is wearing a tight white pants, appear a bit, because she is wearing very small very small briefs, so I look see her one most buttock, at that time my JJ can'ts help rose, see more afflictive more, see classmates be in finally absorption attend a lecture, at that time I draw out my JJ to play with respect to big courage, my eye also is staring at the teacher's buttock to look all the time of course, when I am about to shoot, the teacher comes around come over, but I do not have a canal, reckon she also loses sight of me, I continue again all the time, at that time the teacher halted, the eye looks at me:"Backmost classmate, what are you playing?"
上初2的时候,有一天上语文课,来了一个实习老师,当时我是坐最后一排的,后面也就我一个人坐,当漂亮的女老师转过去在黑板上写字的时候,我看见她穿着一件紧身的白裤子,有点透,因为她穿着一个很小很小的内裤,所以我看的见她一大半屁股,这时候我的JJ不由自主的起来了,越看越难受,最后看看同学们都在专心听课,这时候我就大着胆子掏出我的JJ玩起来,我的眼睛当然也一直盯着老师的屁股看,我快要射的时候,老师转来过来,但是我没有管,估计她也看不见我,我一直再继续,这时候老师停住了,眼睛看着我:"最后面的同学,你在玩什么?"
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Founds three-dimensional analytic model and analyses heat transfer with phase change with the help of numerical simulation software using Euler backward difference.
通过实验分析了冰水两相流在垂直和水平管道流动时的压降特性;建立了冰融解的三维分析模型,采用欧拉向后差分法,利用ANSYS数值模拟软件对冰水相变传热进行了数值模拟分析,得出冰粒大小与融解时间两者的关系曲线。
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At present one-stop network popularizes platform to pay close attention to and be able to apply extensively by more and more enterprises, the network that the advantage that it has depends on popularizing platform to be able to realize much platform through one-stop network spreads the effect, cooperate overall business affairs message with professional search at the same time the service is aggregate discharge of many pure green business affairs, for the enterprise promotion was brought true click the business affairs discharge with efficient green, the gender overturns in the meantime changed the past to click the network that pays fee to extend pattern, effective control ill will clicks what bring the waste on resource cost and information feedback for the enterprise not to coordinate a phenomenon, through the free own help that build a station more does not have a website and need has the company of network promotion, a series of networks such as the website that has oneself on the base that does not raise any cost cost extend a service.
现在一站式的网络推广平台正被越来越多的企业关注并得以广泛应用,它所具有的优势在于通过一站式的网络推广平台便可实现多平台的网络推广效果,同时以专业的搜索配合全面的商务信息服务聚合了大量的纯绿色商务流量,为企业推广带来了真实点击和高效绿色的商务流量,同时颠覆性的改变了过去点击付费的网络推广方式,有效控制恶意点击为企业带来资源成本上的浪费以及信息反馈的不协调现象,通过免费的自主建站帮助更多没有网站而需要进行网络推广的企业,在不增加任何成本费用的基础上拥有自己的网站等一系列网络推广服务。
- 相关中文对照歌词
- I Can't Help Falling In Love (With You)
- With A Little Help From My Friends
- With A Little Help From My Friends
- I Can't Help It (If I'm Still In Love With You)
- I Can't Help It (If I'm Still In Love With You)
- I Can't Help It (If I'm Still In Love With You)
- I Can't Help It (If I'm Still In Love With You)
- Can't Help Falling In Love With You
- I Can't Help It (If I'm Still In Love With You)
- With You There To Help Me
- 推荐网络例句
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I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""
客人们在卡罗利娜·埃凯家里,举止就文雅一些,因为卡罗利娜的母亲治家很严厉。
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Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.
由著名品牌 Herm è s 设计,这件高贵的制服是香港本土制造,是我们第一套不配帽子的制服。
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Do not 'inflate' your achievements and/or qualifications or skills .
不要 '夸大' 你的业绩或成果,条件或者技能。