string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%85%AC%E5%8F%B8%E5%87%80%E5%88%A9%E6%B6%A6%E7%94%A8%E6%9D%A5%E5%B9%B2%E4%BB%80%E4%B9%88 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
公司净利润用来干什么
