A.企業(yè)內(nèi)部規(guī)模經(jīng)濟(jì) B.企業(yè)外部規(guī)模經(jīng)濟(jì) C.市場(chǎng)規(guī)模經(jīng)濟(jì) D.國(guó)家規(guī)模經(jīng)濟(jì) E.產(chǎn)品規(guī)模經(jīng)濟(jì)