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A.結(jié)構(gòu)關(guān)系效應(yīng)B.地區(qū)專業(yè)化C.洼地效應(yīng)D.共享經(jīng)濟(jì)利益
A.內(nèi)部經(jīng)濟(jì)B.外部經(jīng)濟(jì)C.規(guī)模經(jīng)濟(jì)D.范圍經(jīng)濟(jì)