string(285) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%A9%AC%E6%98%8E%E5%AE%87%E4%B8%80%E5%BB%BA%E6%9C%BA%E7%94%B5%E5%AE%9E%E5%8A%A1%E8%AE%B2%E7%9A%84%E5%A6%82%E4%BD%95 => Failed to connect to 101.89.143.195 port 38109: Connection refused"
马明宇一建机电实务讲的如何
