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
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“十五五”时期，是过渡期结束后转向常态化帮扶的新阶段。今年中央一号文件，首次系统性部署实施常态化精准帮扶。