string(242) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=crm%E7%9A%84%E4%B8%BB%E8%A6%81%E5%8A%9F%E8%83%BD%E6%98%AF%E4%BB%80%E4%B9%88 => Failed to connect to 101.89.120.29 port 38104: Connection refused"
crm的主要功能是什么
