题目内容：
混凝土双向受力时，强度变化规律是？
A.双向受拉，强度提高
B.双向受压，强度提高
C.一拉一压，强度提高
D.一拉一压，强度降低
参考答案：
选择题：混凝土双向受力时，强度变化规律是？
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