string(249) "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%A4%9A%E5%B0%91%E9%80%82%E5%90%88%E4%B9%B0%E5%85%A5 => Failed to connect to 101.89.117.144 port 38005: Connection refused"
溢价率多少适合买入
