The same forces that create surface tension in any sample of water are responsible for the maintenance of these unbroken columns of water.
在任何水样中造成表面张力的力支持着这些不断的水柱。
2
We usually every few years of plastic rockery stone for maintenance, maintenanceof the contents are: internal reinforcement, surface repair, complementary framework.
通常我们每隔几年对塑石假山进行维护保养，保养的内容有：内部骨架加固、表面修补、补色。
3
The principle and methods of various surface engineering technologies are introduced, and its study progress and application on manufactured and maintenanceof vehicle engine is summarized.