选择题:Guzheng is our unique and important ethnic musical

题目内容:
Guzheng is our unique and important ethnic musical instruments. As early as the 5th century BC to the 3rd century BC, the Warring States Period, the Qin generation at the time widely circulated. You can say that there are more than 2,500 years of history. It sounds beautiful, rich musical skills, and with the local opera, folk music combine to form a strong local style genre. So by the majority of the people's favorite.

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无差异曲线X1+X2=C的边际替代率是递减的。A A) 正确B B) 错误

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