This article is mainly about the importance and significance of the perimeter shot in a basketball match, and also about how to make more chances to do the perimeter shot and practical training in this.

In this paper, according to the characteristics of central projection, aerial photographs were analyzed to discuss displacement of images under tilt conditin or caused by ground undulation, based on which the principles of tilt error and projection error were summarized.

Based on the analysis of Kruppas theorem and geometric methods sufficient and necessary conditions that figure Φ is a central projection of the space affine coordinate system are put forward in this paper.

A conclusion is drawn that the interdependence between Shanghai s economy and its transport industry is strengthening, and the biggest sectors demanding for the intermediate inputs and final outputs of transport .

There are many difficulties to overcome when we deal with the intermediate input account based on KLEMS system according to the present Chinese official statistical data.

Analysis and selection of the examination target of investigation center;

A new gait recognition method based on Midline projection is presented in this paper.