A comparison was made between the present and past standards of obvious foreign matters in injection fluid to compare their merit and shortcoming by mathematical statistics.

This paper analyzes the current drawing standards in China and compares some of them with old drawing standards in order to give attention in drawing.

This paper gives a brief analysis of the main factors affecting the book\' s weeding criteria for library in a degree,in-cluding physical condition,content,timeliness,duplicates,circulation and usage data,subjective judgment,social survey and etc.