string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%BA%A2%E4%BB%B7%E7%8E%87%E5%9C%A8%E4%B8%80%E4%B8%AA%E4%BB%80%E4%B9%88%E8%8C%83%E5%9B%B4%E5%90%88%E9%80%82 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
溢价率在一个什么范围合适
