string(285) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%83%AD%E5%BC%8F%E6%B0%94%E4%BD%93%E8%B4%A8%E9%87%8F%E6%B5%81%E9%87%8F%E8%AE%A1%E5%8F%82%E6%95%B0%E8%AE%BE%E7%BD%AE => Failed to connect to 101.89.143.195 port 38175: Connection refused"
热式气体质量流量计参数设置
