進(jìn)度績(jī)效指數(shù)小于表明( )A、項(xiàng)目落后于計(jì)劃完成工作的貨幣價(jià)值B、截至當(dāng)時(shí)實(shí)際完成的掙值是100%C、項(xiàng)目已經(jīng)歷了永久性的時(shí)間損失D、項(xiàng)目可能未按進(jìn)度計(jì)劃進(jìn)行,但是項(xiàng)目經(jīng)理無(wú)須擔(dān)憂