The right orientationof teaching purpose is the key element in the raising of teaching quality.
教学目的的正确定位是教学质量提高的关键因素。
2
The orientationoforientation offense is the subjectively mental needs which can not influence the harmfulness and extent of dangerous act, so it can not be token as the constitutive element.
Discrete element method is used to analyze the roof stability in accordance with the variation of its loading, rock frictional Angle, bolt spacing, rock properties and bolt orientation.