string(232) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=21%E5%B9%B4%E4%BA%8C%E5%BB%BA%E6%9C%BA%E7%94%B5%E6%95%99%E6%9D%90 => Failed to connect to 101.91.112.32 port 38221: Connection refused"
21年二建机电教材
