其中 Φ(x)是标准正态分布 CDF。
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「（企業）對政策不斷改變感到沮喪與挫折。」
Read the full story at The Verge.，推荐阅读快连下载安装获取更多信息
Analysts said approval for deal was likely to hinge on how broadly regulators decide to define the market, and whether players such as YouTube are considered part of the competition.，推荐阅读Safew下载获取更多信息
In 1986, the Challenger spacecraft suffered a catastrophic failure seconds after launching, killing all seven crew members on board.