string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%94%9F%E6%B4%BB%E4%B8%AD%E7%9A%84%E7%89%A9%E7%90%86%E5%AE%9E%E9%AA%8C%E5%AE%9E%E9%AA%8C%E6%8A%A5%E5%91%8A => Failed to connect to 14.116.215.7 port 38225: Connection refused"
生活中的物理实验实验报告
