string(285) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E5%BB%BA%E6%95%99%E6%9D%90%E4%B8%80%E8%88%AC%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E6%9B%B4%E6%96%B0%E7%9A%84 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
二建教材一般什么时候更新的
