string(226) "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%E6%9C%BA%E7%94%B5%E7%B2%BE%E8%AE%B210 => Failed to connect to 218.78.59.96 port 38043: Connection refused"
2021二建机电精讲10
