知识付费平台（小报童、知识星球）
17:44, 27 февраля 2026Экономика
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The background radiation from cosmic rays increases with altitude, from 0.3 mSv per year for sea-level areas to 1.0 mSv per year for higher-altitude cities, so for best results use this on a plane or in outer space
Inserts are just inserts; nothing particularly interesting: