单选题:设计使用年限为50年,处于一般环境大截面钢筋混凝土凝土柱,其混凝土强度等级不应低于(  )。

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题目内容:
设计使用年限为50年,处于一般环境大截面钢筋混凝土凝土柱,其混凝土强度等级不应低于(  )。 A.C15
A.C15
A.C15
A.C15
A.C15
A.C15
B.C20
B.C20
B.C20
B.C20
B.C20
B.C20
C.C25
C.C25
C.C25
C.C25
C.C25
C.C25
D.C30

D.C30

D.C30
D.C30
D.C30
D.C30
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