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　　李延年（王雷 饰）：讲述其在抗美援朝战场上的英雄故事。《大国建造》全片以“探寻建筑工程的奇迹”为主线，探秘新地标背后“中国制造、中国建造和中国创造”的奇迹。全片共6集，每集45分钟，以《极限挑战》《栋梁之材》《锤炼成器》《稳如磐石》《律动和合》《匠心巧思》，来揭秘新地标的建设故事。她不动声色地细问了当时的情况，然后笑道：这是应该的。The system configuration change here refers to the change of activity life cycle caused by the switching of horizontal and vertical screens, thus causing the change of resources. In Android, system configuration changes will cause activity destruction and reconstruction, such as horizontal and vertical screen switching, but the switching time difference is too small for the user's eyes to detect. When the activity is rebuilt, just before the previous activity is destroyed, the system will call onSaveInstanceState (Bundle outState) to store various states at that time. In the new activity, Android will read the data through onRestoreInstanceState (Bundle savedInstanceState) and automatically restore to the View of the previous activity. Of course, in the activity, the developer's own code logic needs to be processed by himself.大航海时代。讲述以毛泽东为代表的中国共产党第一代领导人，在国家民族危难之际，召开中国共产党第一次代表大会，建立中国共产党，并带领共产党不懈探索，走向成熟的伟大历程。故事以毛泽东为主的“一大代表”为视角，从1919年之后中国社会主要矛盾出发，以党的发展脉络为根基，展现了革命先辈们在党面临危急关头，在民族遭受危难时刻，通过艰苦卓绝的奋斗，开辟了一条前所未有的革命道路，最终取得了伟大胜利。