string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%8F%91%E8%A1%8C%E5%A4%AE%E8%A1%8C%E7%A5%A8%E6%8D%AE%E5%B1%9E%E4%BA%8E%E4%BB%80%E4%B9%88%E6%94%BF%E7%AD%96 => Failed to connect to 125.88.227.171 port 38062: Connection refused"
发行央行票据属于什么政策
