成败归因理论中，归因的三个维度有内外性归因、稳定性归因与_____。
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画出操作技能形成过程中的练习曲线示意图，并说明其意义。
Why is Hilton testing its Smart Desk concept？
That rivers are used as open sewers for city wastes causes ______ and eutrophication.
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