选择器

A non-linear mathematical model is presented herein to describe the dynamic performance of the governing system for station, and furthermore, the additional index to evaluate the governing performance of the pump-turbine is put forward, that is that the selection of the governor parameters must promote the quick attenuation of the fluctuation of the water level in the surge tank.

文中提出了描述抽水蓄能电站调节动态特性的非线性数学模型，提出了衡量水轮机调节性能质量的附加指标－调速器参数的选择应促使调压室水位波动的快速衰减。

Comparison of no-tillage the ground hard, and crop stubble, and called for a strong ability to choose the soil buried browser.

免耕地面比较坚硬，又有作物根茬，故要求选择入土能力强的开沟器。

Introduce the way of getting additional melt filter on VC406A spinning machine.

介绍了VC406A纺丝机增添预过滤器技术改造的方法，对结构的设计、滤材的选择以及静态混合器的设置做了详细的探讨。

Be capable of speed controller design, electronics components supplier selection, process, testing and quality control.

2可以胜任调速器设计，选择电子零件供应商，加工，测试和品质管控。

Based on the practice of the use of φ95mm subsurface sucker rod pump in Shengtuo Oilfield in recent years, the causes of the failure of the pump are analyzed, and relevant precautions are put forward:(1)selecting oil wells with sufficient fluid supply for pumping;(2)under the condition of the pump efficiency being the same, the submergence depth of the pump being somewhat larger than that of the small pump, and 450～500m being feasible;(3)adopting Grade H ultrahigh-strength rod string and fixing a sinker bar at the bottom of the rod string;(4)selecting long stroke and low pumping speed, and more than 5m stroke and less than 6min-1 pumping speed being recommended;(5)adopting zirconium oxide valve ball and seat ＋ spray welded plunger ＋ nitrided barrel.

根据胜坨油田近几年采用φ95mm有杆抽油泵提液的实践，分析了造成这种抽油泵失效的原因，包括与其配套的脱节器失效、抽油杆断脱、泵漏、电动机不配套和生产管理不善等。为增强泵的提液能力和工作可靠性，提出5 项预防措施：(1)选择有充足供液能力的油井；(2)在保持相同泵效的情况下，泵的沉没度应略大于小泵，推荐按450～500m设计；(3)采用H级超高强度抽油杆柱，并在杆柱底部配置一定重量的加重杆；(4)采用长冲程、低冲次的参数匹配，推荐光杆冲程大于5m，冲次小于6min-1；(5)为提高泵筒、活塞和阀座的防腐耐磨性，推荐采用&氧化锆阀球和阀座+喷焊柱塞+氮化泵筒&的结构形式。

Methods:The study included 3 groups, VVI group（30 patients receiving single-chamber pacing）, DDD group（32 patients receiving dual-chamber pacing）,control group（32 healthy human）. TDI parameters of regional myocardium were observed.

选择近期安装永久起搏器行VVI起搏的患者30例归入VVI组，房室顺序起搏的患者32例归入DDD组，年龄匹配的正常人32例归入对照组，分析3组之间TDI指标的变化及其变化规律。

When high temperature superconductor current lead quenches, shunt carries the currents, so its material option can affect operation cost of HTS current lead.

当高温超导失超后其电流由分流器承载，分流器材料的选择将影响电流引线冷端热负荷和运行费用。

Gear box intermediate gear design, axis design, bearing, key, shaft coupling choice and correlation computation.

变速箱中齿轮的设计，轴的设计，轴承、键、联轴器的选择及相关的计算、校核。

The design is key slot, shaft coupling, gear and bearings for the design parameters of the design process, the application of the Access database, inlay in Auto cad 2004 and the Auto lisp VBA procedures, the main design concepts : using VBA common structure for the selection and design, Access databases and enquiries generated through relevant parameters instead seek out a large amount of information generated readable final text documents (including the document mapping the relevant data used), and then using Auto lisp procedures required readable text documents commonly used in the design of the structure direct mapping.

谁能帮忙翻译一下！谢了！！本设计是对键槽、联轴器、齿轮和轴承进行参数化设计，设计过程中，应用了Access数据库、嵌于Auto CAD 2004的VBA和Auto LISP程序，主要设计思想是：利用VBA对常用结构进行选择和设计，并通过查询Access数据库生成相关参数，而不用再去查找大量资料，最后生成可读文本文件（文件中包括绘图用到的相关数据），然后利用Auto LISP程序调用可读文本文件对设计的常用结构直接进行绘图。

And then the output voltage harmonic for the single-phase three-level SPWM inverter under the half triangular and half saw-tooth carrier wave is studied. It also discusses how to select the carrier ratio N and the effects to the output wave by modulation ratio M.

着重对载波为半波、三角波、半波、锯齿波的单相三阶 SPWM逆变器的输出电压的谐波处理、载波比N的数值选择、调制比M对输出波形的影响等进行了研究。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。