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冷知识

冷知识

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2018-11-29 10:05

海水总含金量=13.35亿吨；按现价每吨3.9千万美元计，总值大约5.2亿亿美元
地壳总含金量=1220亿吨；总值大约475.8亿亿美元

2018-11-29 10:05

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