string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%A3%81%E5%90%B8%E8%A3%85%E7%BD%AE%E5%86%85%E9%83%A8%E7%A4%BA%E6%84%8F%E5%9B%BE => Failed to connect to 14.18.117.71 port 38220: Connection refused"
磁吸装置内部示意图
