string(328) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%94%9F%E7%B2%89%E5%92%8C%E6%B7%80%E7%B2%89%E7%9A%84%E4%BD%9C%E7%94%A8%E4%B8%80%E6%A0%B7%E5%90%97%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E8%83%BD%E7%94%A8%E6%B0%B4 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
生粉和淀粉的作用一样吗为什么不能用水
