A.RAM B.硬盤 C.ROM D.DVD盤
A.0.02cm,0.5cm B.-0.02m,-0.5m C.-0.02m,0.5m D.0.02m,0.5m
A.建設(shè)投資 B.銷售價格 C.運營負(fù)荷 D.原材料價格