string(283) "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%A1%A5%E6%A2%81%E4%BC%B8%E7%BC%A9%E7%BC%9D%E7%9A%84%E4%BD%9C%E7%94%A8%E6%9C%89%E5%93%AA%E4%BA%9B => Failed to connect to 14.18.117.71 port 38220: Connection refused"
二建桥梁伸缩缝的作用有哪些
