The lung and breast are the most common distant primary sites for metastasis to oral soft tissue. 远程癌症转移到口腔软组织,以肺癌和乳癌最常见。
So the paper is intended to give a detailed account of the quality system for the sake of the qualified distant education. 从远程教育的质量观出发,阐述远程教育质量体系,远程教育质量保证的含义和作用,对探索远程教育质量保证的实现途径将颇有益处。