2.美国市场营销学家( )把各种市场营销要素归纳为四大类:即产品(product)、价格(pric

2.美国市场营销学家( )把各种市场营销要素归纳为四大类:即产品(product)、价格(price)、分销(place)、促销(promotion)。

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已知某周期信号的傅里叶级数展开式为x(t)=A/2+∑4A/(nπ)2sinnπ/2sinn,试求该

已知某周期信号的傅里叶级数展开式为x(t)=A/2+∑4A/(nπ)2sinnπ/2sinn,试求该信号的直流分量、第一至第五次谐波分量的幅值。

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After several years of hard work, he ______ pass t

After several years of hard work, he ______ pass the entrance exam.A、couldB、can

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10. Ultimately the advertising industry should____

10. Ultimately the advertising industry should__________.A. take its job more e

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