http://yunpan.hhu.edu.cn/cloudservice/outerLink/decode?c3Vnb24xNjAyNzcyNTY0MTQzc3Vnb24=

土的渗透性可见用如下网址查看http://yunpan.hhu.edu.cn/cloudservice/outerLink/decode?c3Vnb24xNjAyNzY4MzcwNzE5c3Vnb24=