方位投影变形分布规律研究

Study on Distortion Law of Flat Projection

地图投影是地图的数学法则之一,了解地图投影中变形的分布规律对正确选择和使用地图有重要意义.文章阐述了正轴方位投影的简易绘制方法,按照从特殊到一般的逻辑推理方法,推演出方位投影的变形分布规律.

Our survey and following analysis reveal that most college students like sports and are able to do physical exercise in their ways. However, the study shows that reforms are necessary in aspects of school physical education and assessment of the teaching. College students take part in sports mainly to build their constitution and improve their health. The problems are part of them （30. 1%） needs proper and scientific methods in their exercise ; or the frequency of exercise and time span for each exercise are not sufficient for effective results. Hence three countermeasures： popularizing the knowledge of physical exercise and emphasizing proper scientific ways of exercise ;reforming the present teaching contents and adding sports popular with college students; providing necessary conditions for students;physical exercise and giving due emphasis on the assessment of students＇xercise.