The slidingphenomenon between coal seam and its roof or floor is very common.
煤层及其顶底板中滑动现象极为普遍。
2
This is so because the resistance to motion is essentially due to the deformation of the rolling elements and, hence, is not a slidingphenomenon.
之所以这样是因为对运动的阻力基本上源于滚动零件的变形,而不是滑动现象。
3
This paper introduces the wave-shape slidingphenomenon of hot strip steel discovered by the author in the research work and analyzes the reason of this phenomenon elementarily.