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Why do small errors make it impossible to predict the weather system with a high degree of accuracy? Beyond two or three days, the world's best weathe 阅读全文
posted @ 2020-02-14 15:13
张乐珊
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What do oilmen want to achieve as soon as they strike oil? The deepest holes of all are made for oil, and they go down to as much as 25,000 feet. But 阅读全文
posted @ 2020-02-14 14:42
张乐珊
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posted @ 2020-02-14 14:09
张乐珊
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