产业“家底”更加厚实。粮食产量连续两年稳定在1.4万亿斤以上，制造业增加值连续16年稳居世界首位，工业增加值对经济增长的贡献率升至35%，服务业增加值占国内生产总值（GDP）的比重增至57.7%。
The Streams Standard was developed between 2014 and 2016 with an ambitious goal to provide "APIs for creating, composing, and consuming streams of data that map efficiently to low-level I/O primitives." Before Web streams, the web platform had no standard way to work with streaming data.，推荐阅读im钱包官方下载获取更多信息
def close(self) - None:。关于这个话题，雷电模拟器官方版本下载提供了深入分析
添加图片注释，不超过 140 字（可选），详情可参考safew官方下载