string(269) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E5%B9%B4%E6%B3%A8%E5%86%8C%E5%92%A8%E8%AF%A2%E5%B7%A5%E7%A8%8B%E5%B8%88%E8%AF%95%E7%AD%94%E6%A1%88 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
2021年注册咨询工程师试答案
