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当前学科:第十四章土木工程施工与管理
题目:
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关于先张法预应力混凝土施工,下列中哪个规定是正确的?()
A . 混凝土强度不得低于C15
B . 混凝土必须一次浇灌完成
C . 混凝土强度达到50%方可放张
D . 不可成组张拉
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