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)


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