A.有形B.邏輯C.物質(zhì)D.消耗
A.35%~50% B.45%~60% C.55%~70% D.65%~80%
A.改正性維護(hù) B.適應(yīng)性維護(hù) C.完善性維護(hù) D.預(yù)防性維護(hù)