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核外电子运动的两大特征是量子化特性和波粒二象性。
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电子云的角度分布图有“＋”、“－”号，原子轨道的角度分布图没有“＋”、“－”号。
Early dorms were enclosed and simply furnished, meant to separate students from the outside world and to provide more privacy for classes and reflection.
The 1950s and 60s saw a surge in political and civil rights debates in America, with the college campus taking center stage.
PowerPoint2010演示文稿文件的扩展名是( )
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