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A.研究經(jīng)濟(jì)變量之間的依存關(guān)系 B.研究經(jīng)濟(jì)規(guī)律 C.測度由經(jīng)濟(jì)計(jì)量學(xué)模型設(shè)定的經(jīng)濟(jì)關(guān)系式 D.進(jìn)行經(jīng)濟(jì)預(yù)測