string(287) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2020%E5%B9%B4%E4%BA%8C%E5%BB%BA%E6%9C%BA%E7%94%B5%E5%AE%9E%E5%8A%A1%E6%A1%88%E4%BE%8B%E9%A2%98%E5%87%BA%E5%93%AA%E4%BA%9B => Failed to connect to 14.18.117.71 port 38220: Connection refused"
2020年二建机电实务案例题出哪些
