string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%93%B6%E8%A1%8C%E7%9A%84%E5%88%A9%E7%8E%87%E5%85%AC%E5%BC%8F%E6%98%AF%E4%BB%80%E4%B9%88 => Failed to connect to 14.18.117.71 port 38093: Connection refused"
银行的利率公式是什么
