假设生产函数为Y=3K+2L，其中K和L分别代表资本和劳动投入。考虑以下有关该生产函数的论断：Ⅰ.该函数表现为规模报酬不变；Ⅱ.该函数给定的所有生产要素的边际产量递减；Ⅲ.该函数给定的边际技术替代率保持不变。其中论断正确的是（ ）。

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