- 搜標題
- 搜題干
- 搜選項
單項選擇題
建筑物的經(jīng)過年數(shù)有實際經(jīng)過年數(shù)和有效經(jīng)過年數(shù)，它們之間關(guān)系為（）.
A.有效經(jīng)過年數(shù)等于實際經(jīng)過年數(shù)
B.有效經(jīng)過年數(shù)短于實際經(jīng)過年數(shù)
C.有效經(jīng)過年數(shù)長于實際經(jīng)過年數(shù)
D.有效經(jīng)過年數(shù)可能長于或短于實際經(jīng)過年數(shù)
