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The holistic design of the system and resolved the designs of software and hardware based on VXI bus are put forward according to the demand of test system. The hardware and software is designed, including the formation and design of hardware system, visual instrument software architecture, program design for instrument driver, high speed real-time data collection. In the dynamic test program, the idea of"software is instrument"was applied to meet the diverse test demands. Last, it is proposed that the VXI test system be developed to more totalization and networked. The basic theory of system identification was introduced briefly at first. The principle of spectrum analysis system identification based on Wiener-Hopf equation was expatiated. and the questions in applying Peusdo Random signal as spectrum analysis methods stimulate signal was studied, The generation principle of the peusdo random signal is researched, the characteristic of peusdo random are analyzed from time domain and frequency domain, the inverse repeat peusdo random signal is brought forward to make up the shortage of ordinary peusdo random signal. And a new chaos genetic algorithmis presented to solve the unprecise problem of the traditional method. In the servo valve dynamic characteristic test system, the spectrum analysis methods was applied successfully, the servo valve dynamic characteristic could be acquired rapidly and exactly, the test results were analyzed and the ameliorate methods were brought forward at last.

结合航天某集团液压测试中心测试系统的需求，提出了基于VXI总线的液压测试系统的整体设计方案，完成了测试系统的硬件设计与软件设计，包括硬件系统构成与设计、虚拟仪器软件结构、仪器驱动程序设计、高速同步实时数据采集等内容；以伺服阀动态特性测试为例设计了测试模块，该模块体现了VXI总线仪器软件开发所倡导的"虚拟仪器"的思想，以软件的灵活应用满足了不同的测试需求；结合自动测试系统的发展，研究了VXI测试系统与网络技术结合，实现各种软硬件资源共享，进一步提高设备及数据的利用率和系统的扩展性，使自动测试向综合化、网络化方向发展；研究了伪随机信号作为谱分析法辨识的激励信号时存在的问题，讨论了伪随机信号的产生机理，从频域和时域分析了伪随机信号的性质及其应用，提出了用逆重复伪随机信号弥补了普通伪随机信号的不足，并以混沌遗传算法对逆重复伪随机信号产生过程中的参数进行优化，可以更合理而不是凭经验产生需要的逆重复伪随机信号。

At last, all related problems due to ship type and towing speed influencing the quality of captured images and results were discussed. A ship model with V-shape bottom and protruding keel might cause some disadvantages for PIV measurements. The use of longer laser light ducts extending deeper is a possible solution. A ship model with light yellow paint will cause the unproportionate of light and will cause white background on captured images. It is suggested to re-paint the ship model in black or dark colors to solve this problem. In high-speed test conditions, a ship model's bow waves entrain large amount of air bubbles into water and those bubbles will block the view of camera causing some random black spots in the images. Thus, it is necessary to remove the useless black spot data and repeat the same test condition if statistics requires enough number of images.

本文讨论建立此系统之技术及实验方法，设备的架置方式和配置为一可调性调整之开放式架构，质点施放方法以一自制的施放架於实验前先布置於测试段中，并制定一实验流程规范，再分别针对实验所得滑航型及排水量型船模的流线方向及切流线方向各不同位置及船速之速度进行流场分析；实验结果发现不同船型会造成不同的实验困难：船形上突起之龙骨及V形船底会遮住照明光线，可利用较深之导管调整光页角度改善；而浅色船模表面会造成光线的不均匀，可以更改船模涂装颜色改善；高速实验的气泡会不定点的遮住光线，须先除去无资料区域并使用更多资料组数来改善。

He swore it was not nor ever should be mine; and he'd--But I'll not repeat his language nor describe his habitual conduct: he is ingenious and unresting in seeking to gain my abhorrence!

他赌咒说那屋子本来不是，也永远不会归我所有；而且他要——可我不愿意再重复他的话，也不愿意描述他那照例的行为：他巧妙地、无休止地想尽方法激起我的憎恶！

Step 4: Using your hands inside the belly part of the turn of the palm and finger light pull from the collarbone up to his chin, this movement began to move his hands from the neck side to the other side, repeat to do 6 to 8 times.

第4步：用双手内侧手掌和指肚部位交替从锁骨向上轻拉至下巴，这个动作双手从颈部一侧开始移动到另一侧，重复做6～8次。

The urologist will usually repeat the examination and the blood test.

该泌尿科医生通常会重复检查及抽血化验。

Well, i mean, i can't repeat them verbatim...

好吧，我可没法逐字重复

To avoid that I asked if we could burn the intro sequence to a laser videodisc. I figured this would avoid the risk of jamming or wearing out and the movie could just be set to repeat all day.

为了避免这一缺陷，我提议是否能将影片刻在一张激光视盘上，这不仅解决了媒介的容量与磨损问题，还能使影片不间断地反复播放。

Carrier butterflies are able to vocalize and repeat instructions, serving as a primitive yet effective means of communications over long distances.

信蝶能讲话和重复命令，是一种原始而有效的长距离通讯工具。

Now the American Automobile Association Foundation for Traffic Safety In Washington D. C. is planing to repeat Japan's success.

现在美国华盛顿特区的美国汽车联合会交通安全基金会正计划借鉴日本的成功经验。

However, critics argued Washoe only learned to repeat sign language movements from watching her teachers.

可是，批评家们认为，瓦肖仅仅学会了通过观察她的老师来重复手语动作。

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。