string(243) "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%E6%A8%A1%E5%BC%8F => Failed to connect to 101.89.117.144 port 38056: Connection refused"
什么叫做b2b销售模式
