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例如,5角硬币材质由钢芯镀铜合金改为钢芯镀镍,抗变色性能明显提升,正背面内周缘由圆形调整为多边形,方便特殊群体(弱视)识别。

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Many of us work in an endless stream of tasks, browser tasks, social media, emails, meetings, rushing from one thing to another, never pausing and never ending. Then the day is over, and we are exhausted, and we often have very little to show for it. And we start the next . . . 科幻未来

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Many of us work in an endless stream of tasks, browser tasks, social media, emails, meetings, rushing from one thing to another, never pausing and never ending. Then the day is over, and we are exhausted, and we often have very little to show for it. And we start the next . . . 灵异鬼怪