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Temperature distributions in a display case controlled by thermostatic expansion valve and electronic expansion valve are studied in this paper.

对热力膨胀阀和电子膨胀阀控制下陈列柜内的温度分布做了实验研究。

Spiral steel pipe company's existing production lines, two of hot-rolled seamless steel pipe production line and four thermal expansion seamless tube production lines, the production φ219-1820 double-helical SAW pipe joints 200,000 tons,φ57-377 seamless hot-rolled 200,000 tons of steel pipes,φ377-630 thermal expansion Seamless Steel Tube 60,000 tons, product implementation SY/T5037, GB/T9711, GB/T8163, API 5L, API 5CT standards, widely applicable to oil and natural gas industry, chemical industry, general Fluid transport and infrastructure projects such as a bridge piling, sells to 27 provinces, municipalities and autonomous regions, and over 700 sales outlets, the reliable quality and high quality services to our customers has won the recognition and welcome.

公司现有六条螺旋钢管生产线、两条热轧无缝化钢管生产线和四条热扩无缝管生产线，年生产φ219-1820螺旋缝双面埋弧焊钢管20万吨、φ57-377热轧无缝化钢管20万吨、φ377-630热扩无缝钢管6万吨，产品执行SY/T5037、GB/T9711、GB/T8163、API 5L、API 5CT标准，广泛适用于石油天然气工业、化学工业、普通流体输送及桥梁打桩基建工程等，销往全国27个省、市、自治区，700多个销售网点，可靠的质量和优质的服务赢得了广大客户的认可和欢迎。

We develop and apply the Hirota bilinear-θfunction method,Jacobi elliptic function expansion method,linear superposition method and F-expansion method respectively to solve many 2+1 dimensional nonlinear wave models including 2+1 dimensional 2DsG equation,the coupled ZK equation,2+1 dimensional KdV equation,2+1 dimensional long wave short wave resonance interaction equation and 2+1 dimensional dispersive long wave equation,abundant Jacobi elliptic function doubly periodic solutions are derived.These solutions show various periodic wave shapes and special periodic characters.

发展和应用Hirota双线性-θ函数方法，雅克比椭圆函数展开法，线性叠加法，F-函数展开法等分别求解2+1维2DsG方程，耦合ZK方程，2+1维KdV方程，2+1维长波短波共振相互作用方程，2+1维色散长波方程，获得丰富的雅克比椭圆函数双周期波解，描述了一些周期波形态及周期特性。

In our country, the development of road transportation is mainly simple scalar expansion of low level, The growth of factor productivity contribute small to the economy increase, and the mainly character is: The development of road passenger transport and road freight is mainly the expansion of quantitatively and scalely;the development of road transportation depends on the infrastructure's high devote and market demand increase; technical is draggle and energy consumption is high, the Structural upgrade of industry is slow.

在我国，道路运输业的增长以低水平的简单数量扩张为主，要素生产率提高对增长的贡献度较小，具体表现为：道路客货运输服务的发展以数量和规模的扩大为主；道路运输业的发展仍然依赖于基础设施建设的高投入和市场需求的扩大；技术水平较低，能耗高，产业结构升级步伐缓慢。

Pair of EDH structure catalyst flow field carries on the value simulation simulation, discovered the EDH enlargement mode expansion tubular construction may improve the catalyst obviously the speed of flow distribution, and can reduce the flow resistance, is one kind of effective expansion tubular construction form.

4对EDH结构的催化器的流场进行数值模拟仿真，发现EDH增强型扩张管结构可以较为明显地改善催化器的流速分布，并能降低流动阻力，是一种有效的扩张管结构形式。

High-elastic and constant elastic alloys, low expansion and fixed-expansion alloy.

高弹和恒弹性合金，低膨胀和定膨胀合金等。

The NODE can be solved by F-expansion,which can be thought of as a generalization or concentration of the Jacobi elliptic function expansion method.

在求非线性数学物理方程的精确解方面，最近提出的F-展开法[3~13]是很有效的工具。

In this paper, applications of theJacobi elliptic function expansion method and F-expansion method in constantand variable coe?cient nonlinear evolution equation are considered.

本文主要讨论了Jacobi椭圆函数展开法和F-展开法在求解常系数和变系数非线性波动方程中的应用。

See the expansion board power section for more information on powering servos when the expansion board is present.

用扩展板的时候，看看扩展板的电源部分，以便获得更多给伺服供电的信息。

An expansion board that plugs into the computer's expansion bus.

一种扩展卡，插入计算机扩展总线中。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。