梯形

The method used to find the area under a line on a velocity-time graph depends upon whether the section bound by the line and the axes is a rectangle, a triangle or a trapezoid.

求速度时间图像下面的面积的方法取决于这些面积是否矩形、三角形或梯形。

The closed loop control system simulation was carried out based on ARX model and BP neural network prediction model to prove the feasibility of this method.

为了进一步验证该方法的有效性，设计了梯形、渐变哑铃形和突变哑铃形三种不同形状的工件，以代表实际焊接过程中不同的散热条件。

Provided the choice result of the PLC and the PLC I/O elements, and has explained the design process of the PLC user program in detail, which includes the exposition to the design process of the public program, manual program of the stand-alone, autoloading program of the stand-alone, automatic/ autoloading program of whole machine, automatic return the origin program of whole machine, signal showing and trouble alarm program, and provide the trapezium drawing of all programs mentioned above .

在液压传动PLC控制系统的设计部分，给出PLC及其输入／输出元件的选择结果，详细地阐述了PLC用户程序的设计过程，其中包括对公用程序、单机单步程序、全机半自动程序、全机自动回原点程序的设计过程的阐述，并给出了上述程序梯形图。

The sequential coned design of the PLC, ladder-type patterned program is introduced, as well as the basic stracture and rule of the conversion of sequential fanction patter.

介绍了可编程控制器梯形图程序的顺序控制设计法，顺序功能图的基本结构及其转换实现的基本规则。

This cosmetically elegant and durable trapezoidal enclosure is made of high-impact polypropylene with a metal grille.

这件化妆用优雅而持久的梯形附件以一个金属制的格子是用高冲击聚丙烯做成的。

This paper mainly deals with the steady-state population of a moving ladder-type three-level atom (in the case of nearly equispaced levels ) driven by a superposition of a monochromatic laser wave with a broad-band squeezed vacuum.

本文主要研究宽带压缩真空下，一束单色激光驱动的运动梯形三能级原子的稳态布居。

A fully ethoxy-terminated polymethylsilsesquioxane has been prepared via a dehydration ethanolysis reaction between absolute ethanol and an ordered ladder-like HO-Me-T, which improved long-term storage stability of HO-Me-T. Meanwhile, EtO-Me-T can still participate in the cross-linking reaction with hydroxy-terminated PDMS in the presence of catalyst.

利用含端羟基的LPS与无水乙醇之间的催化脱水反应合成了一种乙氧基为末端基团的活性梯形聚甲基倍半硅氧烷，有效地改善该类聚合物的长期稳定性；同时，该乙氧基封端聚合物仍然具有活性，可以代替常用的正硅酸乙酯与羟基硅油进行交联反应。

Seed scales closely overlapping, often reniform, trapeziform, or flabellate, woody, base narrowed, deciduous at maturity.

重叠的接近的种鳞，通常，梯形，扇形，木质的或，基部狭窄，成熟时落叶。

We studied their properties by IR, NMR, OPM and DSC and found that the ratio of Cu2+/DK-C11-C12 affects the mesomorphic temperature range and the results show that chelating units can play a mesogen function.c Synthesis and mesomorphic properties study of Cu-coordinating liquid crystalline polysilsesquioxanes with heptyl group on the side chain.

2对以β-二酮为侧链的梯形无规聚硅氧烷铜络合物用IR，NMR进行了结构表征，用DSC，偏光显微镜等方法进行了液晶性能的表征，并与同类化合物的性能进行了比较和研究，结果表明：Cu~(2+)含量对液晶相温度区间有明显的影响。

They are:In the third chapter, the crystal structures of these new dca complexes are described anddiscussed in detail. Besides two mononuclear complexes, 1 and 2, complexes 3～15 arecoordination polymer with novel and interesting structural characteristics. 3, 6, 7, 8, 9 are 1Dpolymers, 4 and 5 are of 2D extending structure, while 10, 11, 12, 13, 14, 15, 16, 17 form thefirstly reported series heteronuclear dca coordination polymer, in which (except 10) differentbuilding blocks, with different metal ions in them, construct interesting architecture, like α-and β-type 〓 chains, ladder chain 〓, scaffold structure of 12, and "sandwich"layer structure in 15 and 16, etc..

这些配合物是：第三章中，我们详细描述讨论了这些新型的二氰胺配合物的晶体结构，除两个单核配合物1和2之外，其余十五个为配位聚合物并具有新颖和有趣的结构特征。3，6，7，8，9是一维配位聚合物，4和5则呈现二维扩展结构，而10，11，12，13，14，15，16，17属于首次报道的一系列的二氰胺异金属配位聚合物，其中(除10外)含有不同金属离子的构造&砌块&可构建出有趣的结构，如α-和β-型〓链，梯形链〓，12中的脚手架结构，以及15和16中的&三明治&层状结构等。

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。