string(261) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BB%80%E4%B9%88%E5%8F%AB%E5%81%9Ab2b%E9%94%80%E5%94%AE%E4%B8%9A%E5%8A%A1%E6%B5%81%E7%A8%8B => Failed to connect to 101.89.159.206 port 38087: Connection refused"
什么叫做b2b销售业务流程
