I think if += would always have to make a copy, I would have opted to not support it for lists at all and just say .extend(), which does work in that tuple case.
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On top of direct military expenditures, Smetters projected an additional economic loss to the United States alone of approximately $115 billion, with a wide band of uncertainty stretching from $50 billion all the way to $210 billion. “Again, [there’s] more uncertainty at the top end,” he noted, flagging that the upside risk is greater than the downside. That broader economic impact accounts for disruptions to trade, energy markets, and financial conditions that a sustained conflict in the Middle East typically triggers.，详情可参考旺商聊官方下载
中国科学技术发展战略研究院副研究员韩军徽曾撰文分析，与传统举国体制不同，新型举国体制是社会主义市场经济的产物，更加强调“支撑重大产业发展需求”，以使我国加快建成科技强国。