string(271) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E5%B8%82%E5%9C%BA%E8%90%A5%E9%94%80%E5%AD%A6%E8%80%83%E8%AF%95%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88 => Failed to connect to 101.89.159.206 port 38087: Connection refused"
2021市场营销学考试题及答案
