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The Mega-Brands That Built the World
The innovations, failures and incredible achievements of some of the most successful businesses in history, from megastores like Costco and Walmart to shipping giants like FedEx and UPS, that forever ...
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每日一词|最小离地速度 minimum unstick speed
在飞机的审定试飞中,最小离地速度试飞被称为性能试飞的“三大战役”之一。最小离地速度就是飞机起飞时需要的最小“启动力量”,它能够确保飞机获得足够的升力,离开地面。如果速度不够,飞机就像没受到足够拉力的弹球,无法起飞,被“困”在地面。
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