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90°C 的咖啡在 25°C 房间中冷却。10 分钟后是 75°C。用牛顿定律建模 T(t) 。何时达到 30°C?
90°C 的咖啡在 25°C 房间中冷却。10 分钟后是 75°C。用牛顿定律建模 T(t) 。何时达到 30°C?
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