string(243) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%80%E5%BB%BA%E6%9C%BA%E7%94%B5%E7%AD%94%E6%A1%88%E8%A7%A3%E6%9E%90pdf => Failed to connect to 101.89.143.195 port 38109: Connection refused"
一建机电答案解析pdf
