string(287) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=qa%E4%B8%8Eqc%E7%9A%84%E5%B7%A5%E4%BD%9C%E8%81%8C%E8%B4%A3%E4%B8%BB%E8%A6%81%E5%8C%BA%E5%88%AB%E6%98%AF%E4%BB%80%E4%B9%88 => Failed to connect to 14.116.215.7 port 38225: Connection refused"
qa与qc的工作职责主要区别是什么
