Some suggestion about adopting different ways of prevention and control of water inrush in different hydrological condition have been put forward so as to decrease the influence of water inrush factors, prevent water inrush and ensure mine safety.

American higher education that rises rapidly in mere 300 years has close relations with the four prominent factors which includes multiculture of America、divided-power education system、prosperous private university and legal system of perfect higher education.

Based on the column of rock mass in A Coal Mine,the distributions of stress in mining floors are simulated by using the numerical testing machine (RFPA) at the moment when longwall mining is pushed on to 25 meters and 50 meters respectively; and the water-inrush-factors are calculated on the basis of the relationship between permeability parameters and strain.

According to the traffic conditions and the characteristics of traffic accidents on high-class highway in China,the outstanding factor method is put forward to analyze the black spots.