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100 L 装满纯水的坦克,每分钟进入 5 L 浓度 10 g/L 的盐水,并排出 5 L/min。30 分钟后浓度是多少?
100 L 装满纯水的坦克,每分钟进入 5 L 浓度 10 g/L 的盐水,并排出 5 L/min。30 分钟后浓度是多少?
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