四线的

Proposed a new method of determining the cell thickness and the twist angle of twisted nematic liquid crystal cells, a quarter-wave plate was inserted between the liquid crystal cell and the analyzer, a stepper motor rotated the Retarder by , and measured the light intensity of every modulated point, solved the stokes parameters of polarization light exiting from the liquid crystal cell using Fourier analysis method, thereby determining the cell thickness and the twist angle.

本文提出了一种测量扭曲向列相液晶盒盒厚与扭曲角的新方法，在液晶盒和检偏器之间放置四分之一波片，通过旋转此四分之一波片，测量各个调制点的光强，用傅里叶分析法计算线偏振光穿过液晶盒后的stokes矢量，从而求出液晶盒盒厚以及扭曲角。

Some properties of inversions are proved, It indicates that the inversion is conformal, the image of line of curvature is still the line of curvature of the inversion S of the hypersurface S, the principal curvature, the total curvature, and mean curvature of S are the functions...

在n-1维超曲面的反图变换中，示明反图变换为保角表示法，曲率线系的反影仍为反超曲面的曲率线系，反超曲面的主曲率，全曲率与平均曲率为原超曲面的主曲率的函数等。 3。最后导出公式(1)在四维空间与通常空间之特殊形式

The first part of the whole, including: the main-scale displacement and the identification, map type, weight and general layout of calculating the focus of the plan is formally established; into the second performance, including: self-transformation and-line mapping, static water Calculation and static hydraulic curve, the stability of floating state calculation; third dip into the calculation; summed up into the fourth part, based on an evaluation of the design, lessons learned, the comprehensive knowledge.

第一部分为总体部分，包括：排水量及主尺度的确定、型线图、重量重心计算和总布置正式图的确定；第二部分为性能部分，包括：仿式变换与型线图绘制、静水力计算及静水力曲线图、稳性浮态计算；第三部分为大倾角计算；第四部分为总结部分，为本次设计作出评价，总结经验教训，综合所学知识。什么专业的？搞这么复杂的东西。报酬就免了，给了我也拿不到。

The critical point means such a state that all the differences between gas and liquid disappear completely,being a most important parameter of dividing the types of fluid and being widely verified in both theory and practice.Currently,four methods of determining critical point are summarized as follows:①laboratory measurement through examining critical opalescence or recording the bubble point and dew point curves;②empiric relation;③calculation of the bubble point and dew point curves by PVT software;and ④ direct calculation according to thermodynamic theories.

随后对临界点进行确定，临界点是气液一切性质差异均消失的状态，是区分流体类型最重要的参数，并得到了理论和工程应用的广泛验证，目前确定临界点大致有四种方法：①实验测定，通过观察临界乳光现象或记录流体的泡点和露点线；②经验关系式；③通过PVT软件计算流体的泡点和露点线；④利用热力学理论直接计算。

The symbol for the square shows four lines measuring the distance of four planets placed at the point where each pair of lines meet.

4分的符号表示了四根测量4个行星的距离的线，这4个行星是位于每对线都合适的点上。

The examples given have proved the advantage of the Boundary Element Method. In the analysis of the fracture mechanics using Boundary Element Method, the calculation model of one-quarter singular element has been established, and has been proved its validity.

把边界元法应用于线弹性结构断裂分析中，建立了裂尖奇异区分析的四分之一奇异元计算模型，算例表明，用四分之一奇异元分析断裂力学问题是一种有效的逼近裂尖场的数值方法。

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This allows two-line printing at the speed of a single line, or four-line printing at the speed of two lines, thanks to an innovative dual nozzle printing system using two streams of independently deflected ink, rather than a single ink jet.

这允许在一个单一的线路，或四速线在两线高速打印两行打印，以创新的双喷嘴的打印系统使用两种独立偏转的流墨，而不是一个单一的喷墨感谢。

With up to four people over the years in the domestic auto industry's efforts, at the same time learn from at home and abroad with extensive industry experience and advanced technology for FAW-Volkswagen, the steam, Shenyang Brilliance, FAW Body Works, Jilin light, Kazakhstan light, Nanjing, FAW Yangzi, and other manufacturers to provide a large number of aerodynamic balance Manipulator, the empty mobile trolley, spring balancer, vertical and horizontal translation pulley, fixed-feed welding torch, simple open-book line, reciprocating spray paint machine, Welding side Wai transmission lines, no activities on the press table-technology equipment such as vehicles.

四达人凭借多年来在国内汽车行业中的努力，同时广泛汲取国内外同行业的先进技术和经验，为一汽大众、二汽、沈阳华晨、一汽车身厂、吉林轻型、哈轻、南汽、一汽扬子等众多厂家提供了大量的气动平衡机械手、空车移动小车、弹簧平衡器、纵横平移滑车、固定式馈电焊枪、简易开卷线、往复式喷漆机、焊装侧围输送线、无活动工作台压机上模车等工艺装备。

It has also been awarded the title of the Foreign-founded Enterprise with Advanced Technology and won the honor of the Most Honest Enterprise. At present, Tianzhicai possesses two advanced 8C and 10C web press printing production line, and many four-color offset presses from Japan Matching with modern printing equipment, the company is also equipped with post-printing machine: two saddle stitch binding lines.

公司拥有世界上最先进的两条日本东芝十色、八色商业轮转机生产线，及日本小森四色胶印机多台，后工序配有两条骑马联动线、胶状包本线，公司以现代化的科学质量管理体系，为客户提供从设计印刷到装订的一条龙全程服务。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。