A.經(jīng)濟(jì)效益預(yù)算是項(xiàng)目完成后關(guān)于項(xiàng)目所產(chǎn)生的經(jīng)濟(jì)效益的結(jié)算
B.經(jīng)濟(jì)效益預(yù)算是改進(jìn)后項(xiàng)目水平與改進(jìn)前項(xiàng)目水平的差值所產(chǎn)生的經(jīng)濟(jì)效果
C.經(jīng)濟(jì)效益預(yù)算是項(xiàng)目目標(biāo)水平與改進(jìn)前水平的差值所產(chǎn)生的經(jīng)濟(jì)效益的估計(jì)值
D.以上說(shuō)法都不對(duì)