string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E7%BB%9C%E9%94%80%E5%94%AE%E7%9A%84%E5%B7%A5%E4%BD%9C%E8%81%8C%E8%B4%A3%E6%98%AF%E4%BB%80%E4%B9%88 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
网络销售的工作职责是什么
