In the information gathering research , the paper uses " redundancy webpage filtering system " to show how to resolve the reconstruction problem in the information gathering process . the paper mainly discussed how to reduce the time complicacy and space complicacy of the filtering system 在信息资源建设方面，本文用“冗余网页过滤系统”来说明如何解决资源建设中的重复建设问题，在研究中主要针对算法的时间复杂度和空间复杂度进行了优化，找到了表达一篇文档的最优特征项个数数值，在确保正确率的基础上加快过滤速度。
Using french chalk which was dried by the 120 air as the normal air model , the quality which the fabric contains particle can be test . considering the fabric ' s reusing , the author has washed the fabric in many ways and compared the washed and unwashed fabrics " purifying performance testing datas . through putting the fabric on the home air condition , the author analysed the effect to the air condition ' s runing and purifying performance 为了将高效滤料进一步推广使用，本文通过试验，得到过滤速度和定量对过滤材料过滤性能的影响；利用120的高温烘干过的滑石粉作为尘源，试验得到该滤料的容尘量；考虑到滤料的重复使用问题，对滤料进行清洗处理，比较处理前后滤料的过滤性能测试结果，看能否对滤料进行清洗。
