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Conclusion: As the name implies, singleTop, if the current instance is at the top of the current task stack, it will be reused directly to test scenario 1. If the current instance is no longer at the top of the stack, create a new instance, such as Test Scenario 2, because it jumps from FirstActivity to SecondActivity every time. Although the SecondActivity instance already exists at the time of jumping to SecondActivity for the second time, another SecondActivity instance is created because it is not at the top of the stack.二十世纪六十年代，在“黑云压城城欲摧”的国际形势下，毛主席一声号令：好人好马上三线。军人后代张力军、农民的儿子马朝阳、“资本家千金”陆若文和留苏归来的向晴等这些充满斗志和激情的年轻人，来到了大西南的崇山峻岭，用生命和青春实践自己的理想同时，又演绎着牵肠挂肚的爱情角逐。 一口京腔的大工匠刘连柱因为爱徒梁玉强喜欢上陆若文，竟要断了师徒关系。直到梁玉强在发射基地因排除故障而牺牲，刘连柱都不肯原谅。但谁也不敢相信，害了他爱徒陆若文居然能请他再次出山，为远程火箭试飞成功一显身手。一生梦想当将军的张力军不幸英年早逝，临终，司令员才发现这个一身毛病的小子却有很多不为人知的贡献。马朝阳出席了全国科技大会，火箭伺服系统的研发成果获得最高奖项，在张力军的坟头，闪光的奖章证明了他生命的意义和价值。借力打力，借刀杀人是范亚父惯用的伎俩。Women: 500m, 3000 m relay;　　気付くとそこは、空の上に浮かぶ石の迷路があったり、ポケモンが大きくなったりする、とっても不思議な場所。Giving meaning and fine coding: (quasi) experts can understand the words and terms in their own fields very quickly, and when storing information, they can consciously adopt various metacognition processing strategies.