def close(self) - None:
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（六）放射性同位素，是指化学元素中具有相同原子序数，但质量不同且能发生放射性衰变的核素。，这一点在旺商聊官方下载中也有详细论述
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Safety advisers called for changes to "high risk" plansThe Artemis overhaul was announced two days after the release of a report by the lAerospace Safety Advisory Panel that said the original plan to move directly from Artemis II to a lunar touchdown in 2028 using a SpaceX lander did not have the proper margin of safety and did not appear to be realistically achievable.