string(294) "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%E8%AF%BE%E6%9C%AC%E9%9C%80%E8%A6%81%E5%A4%9A%E4%B9%85%E7%9C%8B%E5%AE%8C%E4%B8%80%E9%81%8D => Failed to connect to 101.89.117.144 port 38076: Connection refused"
一建机电课本需要多久看完一遍
