string(274) "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%E5%87%A0%E9%97%A8%E8%AF%BE%E7%A8%8B%E8%B0%81%E8%AE%B2%E7%9A%84%E6%AF%94%E8%BE%83%E5%A5%BD => Failed to connect to 14.18.117.71 port 38133: Connection refused"
一建几门课程谁讲的比较好
