The calculation formula of extreme distance and limit interval to draw curves by straight lines on projection plane is deduced.

推导了投影平面上以直代曲的极限距离计算公式，代曲极限间隔值的探求。

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As well around the extreme values of sunspot activity and the time interval of relatively large variations of the acceleration of rotation of the earth may also trigger large earthquakes.

而太阳活动极值前后及自转加速度变化较大时段可能触发大地震。

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According to reports from analyst Mark Schoenebaum of ISI, the FDA wants to ensure that a drug does not increase the QT interval by more than 10 milliseconds even in extreme cases.

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