Atoms have a small positive nucleus with negative electrons orbiting it - Nuclear Model, Ernest Rutherford - Nuclear Model, Shows that positive charge is in a central nucleus - Nuclear Model, Does not explain why electrons orbit the nucleus - Nuclear Model, Nuclear Model,

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快閃記憶體卡是一個開放式範本。它不會為排行榜生成分數。

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選項

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恢復自動保存: ?