string(264) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%AD%A6%E7%94%9F%E4%B8%80%E5%AF%B9%E4%B8%80%E5%B8%AE%E6%89%B6%E6%95%88%E6%9E%9C%E5%88%86%E6%9E%90 => Failed to connect to 14.18.46.51 port 38044: Connection refused"
学生一对一帮扶效果分析
