string(249) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%80%8E%E4%B9%88%E7%AE%97%E5%87%BA%E9%93%B6%E8%A1%8C%E7%9A%84%E5%88%A9%E7%8E%87 => Failed to connect to 101.89.117.144 port 38005: Connection refused"
怎么算出银行的利率
