单项选择题

裂缝间纵向受拉钢筋应变不均匀系数ψ越小表明（）。
A. 混凝土参加工作程度越高，受拉纵向钢筋应变越化幅度越大； B. 混凝土参加工作程度越高，受拉纵向钢筋应变越化幅度越小； C. 混凝土参加工作程度越低，受拉纵向钢筋应变越化幅度越小； D. 混凝土参加工作程度越低，受拉纵向钢筋应变越化幅度越大。

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