string(321) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%A3%80%E6%B5%8B%E5%8D%95%E4%BD%8D%E6%8A%80%E6%9C%AF%E8%B4%9F%E8%B4%A3%E4%BA%BA%E7%9A%84%E4%B8%BB%E8%A6%81%E8%81%8C%E8%B4%A3%E6%98%AF%E4%BB%80%E4%B9%88 => Failed to connect to 101.89.143.195 port 38175: Connection refused"
检测单位技术负责人的主要职责是什么
