四边形

Coupled with the quad seal retainer plate, this alignment assures progressive opening/closing flows, stable throttling, low friction operation and positive closure.

加上四边形密封护圈板，这种对齐定位确保逐级的启/闭流量，稳定的节流，低摩擦操作和积极的关闭。

Weak equilibrium condition, orthogonality condition and energy compatibility condition are used to construct high performance elements. An ideal approach is to suppose that stress satisfy these conditions simultaneously, such as the stress mode of CH (0-1) in 2-D case.

弱平衡、正交性和能量协调条件是构造高性能杂交元的三种手段，三个条件同时满足是一种理想的应力设计方案，四边形单元CH(0-l)的应力是这种理想方案的一个代表。

Good beginner OpenGL framework, added a painted triangle and quadrilateral code, complete and realize the rotating color effect, the basis for entry.

详细说明：初学OpenGL很好的框架，添加了画出三角形和四边形的代码，完成上色并且实现了旋转效果，入门基础。

But in the new hierarchy of interest, people in different interest stratum have different want and interest expectation. This requires that the reform should look for the'parallelogram of the composition of forces'and meet the interest of the majority in the settlement of contradiction and conflict of people's want and interest.

但在新的利益分层结构中，不同利益阶层的人们的需要和利益追求是不同的，改革应在人们的需要和利益的矛盾与冲突中，寻找"平行四边形的合力"，满足最大多数人的利益追求。

Composition of Forces; The parallelogram Formula; Vector; High school student

中文关键词：力的合成；平行四边形定则；矢量；中学生

To construct the parameterization form of reconstruction surface, a new algorithm for the planar parameterization of quadrilateral meshes is presented.

4提出了基于网格简化的四边形网格参数化算法，为构造重建网格的参数曲面提供了新方法。

Mathematics: Understands and applies basic and advanced properties of the concepts of geometry; Use the Pythagorean theorem and its converse and properties of special right triangles to solve mathematical and real-world problems; Understands the basic concepts of right triangle trigonometry (e.g., basic trigonometric ratios such as sine, cosine, and tangent); Uses trigonometric ratio methods to solve mathematical and real-world problems (e.g., determination of the angle of depression between two markers on a contour map with different elevations); Uses properties of and relationships among figures to solve mathematical and real-world problems e.g., uses the property that the sum of the angles in a quadrilateral is equal to 360 degrees to square up the frame for a building; uses understanding of arc, chord, tangents, and properties of circles to determine the radius given a circular edge of a circle without the center

数学：理解和应用几何概念的初级和高级特性；用毕德哥拉斯定理、逆定理以及特殊直角三角形性质解决数学的和现实世界的问题；理解基本的直角三角形三角比；运用三角比方法解决数学的或现实的问题。（等高线图上的两个标记之间的俯角确定）运用形体之间的关系及其属性解决数学的或现实的问题（利用四边形内角和等于360度来为建筑物框架取正，运用弧，弦，切线和圆的性质确定缺少中心的一段圆弧的圆心

First of all, look at the small but easy-to-recognize four-sided group of stars in the constellation Corvus. The top two stars faithfully point to Spica.

首先，看着小但是容易辨认的四边形星座乌鸦座，最高的两颗星会如实得指向角宿。

Cross cut shredders turn paper into diamond, rectangular, or parallelogram shapes.

红十字会反过来削减碎纸机纸变成钻石，长方形或平行四边形的形状。

Hence the largest white diamond (2.04-carats) in the collection is set alone in the centre of a Class Ring and the majority are trapezoid-cut chips set in subtle regimental stripes across a square white gold cuff link, tie bar or ring.

因此，该系列中最大的一颗白钻石（2.04克拉）被独自镶嵌在一枚戒指上，多数都被切割成不等边四边形，镶嵌在精美的方形人造白金袖扣、领带夹或者戒指上面。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。