string(243) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E4%BA%8C%E5%BB%BA%E5%85%AC%E8%B7%AF%E6%A1%88%E4%BE%8B3%E7%AD%94%E6%A1%88 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
2021二建公路案例3答案
