The Competition of "leading position" in the Rise of Central China and the Choice of Regional Policy;
中部崛起“龙头”之争及国家区域政策选择
In the course of the competition, the Delta of Changjiang River and the Delta of Zhujiang River take the leading position in our economic development.
面对新的发展机遇,本文从青岛的发展现状、优势和差距以及如何发挥龙头作用,掀起新一轮经济发展高潮入手,拟定了青岛作为龙头城市的发展目标和实现经济总量大发展、经济结构大升级、制造业水平大提高、经济国际化程度大变化、城市基础设施大改善、人才环境和创业环境大转变的发展思路。
The ore microstructure and gold mineral characteristics of the Longtoushan gold deposit,Guangxi;
广西龙头山金矿床矿石显微结构构造和金矿物成分特征
Multistage ore-forming process and distributing characteristics of Au,Ag elements in the Longtoushan gold deposit,Guangxi;
广西龙头山金矿床多期次成矿及金银元素的分布特征
The human skulls studied in this article are from Longtoushan site in Keshiketeng Banner,Chifeng city,Inner Mongolia.
本文对内蒙古自治区赤峰市克什克腾旗龙头山青铜时代遗址发掘出土的颅骨进行了人种学研究。
Swivel packing seal assembly is the key of the swivel, whose function directly influences its service life, further more, and affects the drilling speed.
盘根密封是水龙头的关键环节,其性能直接影响水龙头的寿命和钻井速度。
The wash pipe packing of drilling swivel showed wear-and-tear continually in drilling process due to its structural design.
钻井水龙头由于结构设计的原因,冲管盘根在钻井过程中不断磨损,特别是在高压泥浆的作用下,盘根密封常常被破坏。
The mean value of work loads on a shaft bearing of swivel and rotary table is determined by basic principles of fuzzy theory, considering the loads' fuzziness and the requirement for reliability.
考虑钻机水龙头和转盘主轴承工作载荷的模糊性及可靠性要求，应用模糊数学基本原理求得平均计算载荷，从而计算出主轴承的模糊可靠性寿命。
Effects of Cast Iron and Chromeplate Tap on Over Night Tap Water Quality;
铸铁和镀铬水龙头对过夜自来水水质的影响
Human-computer interaction problem of tap was discussed from the two aspects: switch device design and flowing angle design.
从开关装置设计和出水角度设计两方面探讨了水龙头的人机交互问题。