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牛顿冷却定律: T(t) - T_a = (T_0 - T_a) \e^(-kt) 。证明差的半衰期为 。
牛顿冷却定律: T(t) - T_a = (T_0 - T_a) \e^(-kt) 。证明差的半衰期为 。
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