string(274) "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%92%8C%E5%BB%BA%E7%AD%91%E5%93%AA%E4%B8%AA%E7%AE%80%E5%8D%95%E4%BA%9B => Failed to connect to 61.171.74.35 port 38041: Connection refused"
二建机电和建筑哪个简单些
