单选题:砌体强度随硬化龄期的增长关系是(  )。

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题目内容:
砌体强度随硬化龄期的增长关系是(  )。 A.一直线性增长
B.基本不会有增长
C.初期增长较快,后期趋缓
D.初期增长较慢,后期渐快
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