A.7 B.14 C.21 D.28
A.5% B.10% C.15% D.20%
A.3 B.7 C.14 D.21
A.20 B.30 C.40 D.50
A.材料损耗费 B.材料超期储存 C.材料被盗和损坏 D.材料进货日期变化