string(265) "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%E5%88%A9%E7%8E%87%E7%9A%84%E8%AE%A1%E7%AE%97%E6%96%B9%E6%B3%95%E5%85%AC%E5%BC%8F => Failed to connect to 14.18.117.71 port 38093: Connection refused"
银行利率的计算方法公式
