Chinese character "high" is a word of high frequency which appears in poems of the Tang Dynasty.

The word“high/low”in spatial adjectives is very important, but less relevant research.

On distance-regular graphs with height one and three;

This paper discusses the characteristics of cyrve ,slope and height of Shuang Xi Kou Bridgeand introduces the selecting and chelking computation of piers in view of these characteri stic

Using a triangle’s height and length of the angular bis ector,some segregative inequality chains of Eular Inequality are deduced.

By using theory and method of distance geometry we study inequalities for the volume and altitudes of an n-dimensional simplex in the n-dimensional Euclidean space E~n.

type factional inequalities concerning to the volume, altitude and the distance from an interior point to the side facet for an n-simplex.

With development base on innovation to build high production and high efficiency coal mine;

Research present situation of coal mining which according to the water body under,to suitably use fully mechanized caving mining technology under the water body,determination reasonable mining upper limit,can better enhance the efficiency and realizes the goal of high production and high efficiency of the coal mine.

In this thesis,on the basis of depositing character and producing practice in thin coal seam,in order to achieve high production and high efficiency in thin coal seam,discusses several technical steps,demonstrates its feasibility,finally brings forward mining technics that is worth spreading and problems being resolved.