其中 Φ(x)是标准正态分布 CDF。
In less than 25 years this will rise to more than half of the rail network being at risk, according to the government's own figures.
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Conservator Jonathan Carr said the Thetford find was made "from extremely thin sheets of metal which have become extremely brittle after 2,000 years in the ground".
Цены на нефть взлетели до максимума за полгода17:55
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