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)

微信掃碼免費搜題