最新精确计算结果是137.035999206(11),准确度达到万亿分之81,相当于测量地球到月球的距离误差不到一根头发丝,因此成为人类历史上测量最精确的物理学常数之一。
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Callable[[T], set[T] if IsAssignable[T, int] else T]。业内人士推荐体育直播作为进阶阅读
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“People were dying and we didn’t know why,” Cornman told me. “We didn’t understand the physics of why the planes were crashing.” The deadly gusts were thought to be blowing in from the ocean or from thunderstorms outside the airports. But the danger turned out to be right above them. In the late seventies, researchers at NCAR and the University of Chicago discovered that the crashes were caused by microbursts—sudden, violent downdrafts. In a microburst, a storm cloud dumps cool air and rain straight down, like water from a broken awning. The air spreads horizontally after it lands, so the pilot thinks he’s flying into a headwind at first. He lifts the plane’s nose slightly and decreases the engines’ thrust. Then the downdraft hits, followed by a vicious tailwind, sending the aircraft to the ground.