题目内容

采用预应力工艺相对非预应力工艺可以（）。

A. 提高结构的刚度
B. 减少砼使用量；
C. 提高砼强度
D. 推迟裂缝的出现。

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对于先张法预应力钢筋张拉程序说法正确的是（）。

A. 张拉至应力设计值、锚固；
B. 进行超张拉、锚固；
C. 张拉至接近设计值、锚固；
D. 超张拉、持荷、放张至设计值、锚固

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