well-ordering principle

And the research of the antirust including the synthesizing of the materials and test of the performance are referring to the principle and theory of surface and colloid chemistry as well as erosion and protection of metal.

该防锈剂的设计、合成及性能测试等均牵涉到表面与胶体化学、金属腐蚀与防护等理论与技术。

The principle of its technology transfer through the rod rotation torque by rotating the rotor at the stator the well fluid give rise to the ground.

其工艺原理就是通过抽油杆传递旋转扭矩，靠转子在定子内旋转，把井液举升到地面。

The concept and features of pure water hydraulics And the operating principle as well as the control system designing of digital throttling valve are introduced in this paper;

介绍了水液压技术的概念及其特点，论述了直控步进式水压数字节流阀的工作原理及其控制系统的设计。

Based on the theoretical principle of percolation mechanism, the mathematical relations between single well production rate and formation pressure in each stratum are derived;

根据渗流力学理论原理，推导出单井产量与各层地层压力之间的数学关系；

Described are the working principle, technical parameters, structure as well as its development and trial operation of the KFW-9 AC inductor generators for through traffic passenger cars.

介绍了国际联运客车用KFW&9型客车交流感应子发电机的工作原理、技术参数、结构及其研制和试运行情况。