The influencing laws of gas drag on the landing point were analyzed according to the discussion about the variation of charging radius with different burdens in their range of grain diameter and the percent of gas drag.

In practice,the landing points of particles are not the same because of their different density,size and shape.

Influence to the Placement of Warhead in Reentry Course owing to Stochastic Wind;

The defined placement of table tennis on arbitrarily condition was defined and aseries of useful calculation conclusion was given.

Thelongshotareaandplacementof200missingthreepointshotsintheexperimentsand62basketballgameswereanalyzed.

The conceiving about point of fall for 750kV transformer substation in north of Ningxia;

The point of fall of transformer substation is researched,and the connection system with.

The experiment shows that the method is not only better than general training method in improving the students basic techniques of driving,accuracy of driving back the ball to the exact point of fall,tacties consciouseness and practical ability,but also possesses the advantages in simpleness,novelty and practicality.

Based on the analysis of the scattering and flying properties of the terminal correction submunition missile, an approximate simulation method for the end points in the ellipse-ring was introduced.

Based on the analysis of the scattering and flying properties of the terminal sensitive cluster warheads,an approximate simulation method for the end points is introduced.