三联管

By direct numerical simulation of Navier-Stokes equations we investigate the three-dimensional evolution of a mixing layer, the three-dimensional merger of two parallel vortex tubes and reconnection of two antiparallel vortex tubes in the thesis.

本文用拟谱方法求解Navier-Stokes方程，对小扰动下平面混合层随时间的演化、同向平行涡管的三维合并和反向平行涡管的重联进行了直接数值模拟。

The rest of this article time control system is composed of MCS-51 Microcontroller AT89S51 do the main control unit, the external circuit with a 12MHZ crystal oscillator, 74LS164 registers, reset circuit, three buttons, LED digital tube to do quadruple the time of the device shows no the needs of extended memory, can achieve its functions.

本文所研究的作息时间控制系统是由MCS-51系列单片机AT89S51做主控部件，外围电路用12MHZ晶体震荡器、74LS164寄存器、复位电路、三个按键、四联LED数码管做显示时间的器件，不需要外扩展存储器，就能实现其功能。

Concrete formula adopted computer control sand, stone, water, cement, admixtures measurement as well as various specifications of models with a variety of processes ( centrifugation, suspended roller, plug-in, PCCP, wind-driven, core-mode vibration technology) series die, various interfaces, such as drainage pipes: level I, level I, socket type, F-type pipe jacking mode, three-stage pressure pipe vibration Process modules for the largest caliber DN3m 4m (domestic exclusive use of stress to eliminate mold, sand blasting processes), is China's only capable of producing PCCP steel cylindrical pressure tube and a variety of cement pipes, such as a full set of equipment and tooling manufacturers, who national key project ¤- Inner Mongolia Wanlian Brothers Pipeline Company Diversion Project, Jilin pipeline, dragon pipe industry, Fujian Nampo, Xi'an, Shanghai tunnel company, REN Bang Tianjin, Beijing, Hubei, China and South Africa, Zhengzhou Jinlong, Nanjing, Zhejiang Tenglong Xinjiang National Unification, Liaoyang Xiaotun so water and drainage pipes around the country supporting the project.

混凝土配方采用电脑程序控制砂、石、水、水泥、外加剂计量以及各种规格型号与各种工艺的（离心、悬辊、插入式、PCCP，风动、芯模振动工艺）系列模具，各种接口形式，如排水管：平口、企口、承插式、F型顶管模、三阶段压力管振动工艺模的最大口径为DN3m×4m（国内独家采用模具应力消除、喷砂工艺生产），是全国唯一能生产PCCP钢筒压力管以及各种水泥管等全套设备与模具的厂家，曾为国家重点工程─—内蒙古万联兄弟管道公司引水工程、吉林管道、巨龙管业、福建南浦、西安、上海遂道公司、天津任邦、北京、湖北中南、郑州金龙、南京、浙江腾龙、新疆国统、辽阳小屯等等全国各地引水与排水管工程配套。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。