string(262) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E5%B9%B4%E4%BA%8C%E5%BB%BA%E6%9C%BA%E7%94%B5%E7%9A%84%E9%9A%BE%E6%98%93%E7%A8%8B%E5%BA%A6 => Failed to connect to 101.89.159.206 port 38187: Connection refused"
2021年二建机电的难易程度
