桨的一种

Secondly,two basic methods of modeling wind wheel are analyzed:one is based on blade element theory;the other is based on blade aerodynamicist theory.

讨论和比较了两种风轮建模的基本方法：一种是基于叶素理论的建模，另一种是基于桨叶空气动力学的机理建模。

Like the remipede, one of the most ancient of all living crustaceans.

例如桨足虫——一种最古老的甲壳动物

In general, the design work with traditional measures is done by hand, which cannot meet the needs of the technology and manufacture. So the author has developed a CAD hydraulic design software fit for lower specific speed axial flow runner, which is easily operated by users.The main research work of this paper is as follows:1 Analyzing the main reason of axial flow power station cannot work well under littler volume of flow in some season and putting forward an improving scheme, pointing out the characters of design under abnormal factors.2 Combined with the development of the industry in our country, the abnormal hydraulic design method of propeller turbine is discussed based on present literature, data and experiment results.3 Guided by the design method of software engineering, a suit of hydraulic design software of Lower Specific Speed Axial Flow Runner is programmed by the object-oriented programming language Visual Basic and a straightforward, concise and standard Windows human-computer dialogue interface is designed for the system, which makes the operation of the system very convenient.4 ActiveX Automation technology is adopted as the interface with AutoCAD and the hydraulic drawings are edited, modified by AutoCAD until hydraulic model drawings according with the demand of engineering practice are output.5 To resolve practice problem, the author has designed a lower specific speed axial flow runner for Duowa Power Station through an example.

论文的主要内容有：1 深入分析很多轴流定桨式水电站枯水季节小流量下不能发电的主要原因，提出减容改造方案，并指出超常规条件下的改造设计特点。2 结合国情及行业发展需要，参考现有资料、文献和前人的研究成果，进行低比转速轴流式转轮叶片水力设计方法的研究，对轴流式转轮叶片的奇点分布法水力设计进行了全面的探索，结合现代计算机技术，找到了一种针对特殊条件的轴流式转轮叶片水力设计方法。3 仔细比较多种AutoCAD二次开发工具后，结合本课题的特点，选用Visual Basic语言，综合应用软件工程的设计思想，进行低比转速轴流式转轮叶片水力设计软件的编制，为系统设计了直观、简洁和标准的Windows人机对话界面，便于用户操作；编程时在考虑到设计条件特殊性的同时，尽量做到程序的通用性，使之可用于解决同一类问题；另外，大部分程序还可移植到普通轴流式转轮叶片水力设计中，具有良好的适应性。4 利用ActiveX Automation技术与AutoCAD接口，对AutoCAD进行二次开发，在AutoCAD下实现水力图的自动生成和编辑，直至输出符合实际工程要求的木模图。5 通过算例，为多哇水电站设计了一个低比转速轴流定桨式转轮，解决其在枯水期小流量下不能发电的问题。

This means that if the kayak capsizes it will not fill with water and the paddler can, with a manoeuvre known as an "Eskimo roll", right the boat again.

这就意味着如果皮艇翻了，它也不会进水，而桨手可以用一种叫做"爱斯基摩翻滚"的动作，再把船给正过来。

The Fire Galley is a short-range vessel used to defend against other ships. Fire Galleys are superior to Trireme in one-on-one combat.

烈火战船是一种用于对抗其他战船的短射程战船，在一对一对抗三列桨战舰时具有优势。

This paper presents a wake impingement modelthat was incorporated into a panel method code,Propella,and its applications in simulations of a podded propeller .

本文介绍一种已经嵌入一面元法程序的尾涡砰击模型，及其在一吊舱桨尾涡撞击支柱诱导表面压力模拟中的应用。

They are capable of surviving out of water, and when on land their skin secretes a gelatinous goo to retain moisture However, their large paddle feet are better suited for swimming, and waterhorse dragons tend to move very awkwardly when on land.

它们不在水里也能存活，当在陆地上时它们的皮肤会分泌一种凝胶状的粘液以保持湿润。然而它们大桨一般的脚更适合用来游泳，当在陆地上时水龙马移动得相当笨拙。

Any of various implements resembling the paddle of a boat or canoe, as

桨状物：一种类似船或小舟的桨的工具，如

For the problem in these two methods,the blade element is divided by using weight number in first method and the influence by trailing vortex is considered correspondingly.As a result, the wind wheel model is more reasonable and accurate.

针对以上两种方法建模时遇到的问题，在前一种方法中运用权系数来分隔桨叶的叶素，而后一种方法充分考虑了尾涡流效应的影响，更加合理和精确的建立的气动模型。3。

The serial disc chippers is special equipment for producing high-quality wood chip, extensively used in the material-preparing process of industries as pulp papermaking, shaving board, MDF and in independent wood chip production base, log is the main raw material for cutting.

产品规格： BX1220，BX1216，BX1230等根据实际产量选型详细描述：系列盘式削片机是生产优质木片的一种专用设备，广泛用于纸桨造纸、刨花板、中纤板等工业生产的备料工段和单一的木片生产基地，切削原料主要是圆木。

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％。