冷知识mynlm (25)in #gold • 6 years ago (edited)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 #seawater
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