单选题:混凝土割线模量Gc与弹性模量Ec的关系为Gc=nEc,当混凝土处于弹塑性阶段时,(  )。

题目内容:
混凝土割线模量Gc与弹性模量Ec的关系为Gc=nEc,当混凝土处于弹塑性阶段时,(  )。 A.n>1
B.3n=1
C.n<1
D.不定

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