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碳-14 测年：骨头含 30\% 原始碳-14。已知 \tau_(1/2) = 5730 年，骨头多少年？
碳-14 测年：骨头含 30\% 原始碳-14。已知 \tau_(1/2) = 5730 年，骨头多少年？
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