string(260) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2020%E5%B9%B4%E4%BA%8C%E5%BB%BA%E9%80%9A%E8%BF%87%E7%8E%87%E4%BC%9A%E4%B8%8D%E4%BC%9A%E9%AB%98 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
2020年二建通过率会不会高
