In the process of using the military airfield regulations in clearance,since the user may confuse the current rule with the old one,the paper analyzes and compares the differences between the current rule and the old one in clearance,with special emphasis placed on the revised parts of the basis principles,the composition of the clearance zones and the obstacle limits.

For greater benefit, the railway freight requires operation of double-decked container trains, making the clearance under the railway overpass insufficient.

From purposes and clearance specifications of reserve runway, this paper points out the deficiencies in the airfield clearance regulations of reserve runway, and presents the composition of and the requirement for the reserve runway clearance area.

Detailed analysis was made on the civil airport clearance specification and its basis as well as main affecting factors.

On Childishness by Li Zhi in the Ming dynasty has connotations of five fields ; emptiness and nothing, naturalness , one moment of thought , for oneself and true feeling, namely, excluding traditional morality and ration.

Through study on characteristics of the spatial distribution of commercial orebody and the enrichment regularity of gold mineralization in HaDeMen Gold Field,the spatial location regularity and characteristics of commercial gold ore body are exposed in this paper.

In the present paper westudy the maximum dissipative extension of Schrodinger operator,introduce the generalized indefinite metric space and get the representa-tion of maximum dissipative extension of Schrodinger operator in natural boundaryspace,make preparation for the further study longtime chaotic behavior of infi-nite dimension dynamics system in nonlinear Schrodinger equation.