string(238) "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%E5%85%AC%E8%B7%AF%E6%A1%A5%E6%A2%81%E6%A1%88%E4%BE%8B => Failed to connect to 61.171.74.35 port 38041: Connection refused"
二建公路桥梁案例
