string(258) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BF%83%E7%8E%87%E4%BF%A1%E5%8F%B7%E9%87%87%E9%9B%86%E7%B3%BB%E7%BB%9F%E8%AE%BE%E8%AE%A1 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
心率信号采集系统设计
