string(303) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E5%BB%BA%E6%9C%BA%E7%94%B5%E5%AE%9E%E5%8A%A1%E7%9F%A5%E8%AF%86%E7%82%B9%E5%A4%AA%E5%A4%9A%E4%BA%86%E6%80%8E%E4%B9%88%E5%8A%9E => Failed to connect to 101.89.117.144 port 38005: Connection refused"
二建机电实务知识点太多了怎么办
