【单选题】【消耗次数：1】
预应力钢筋张拉程序中的持荷2min的作用是（）。（第八章知识点2先张法）
①
降低钢筋的塑性变形
②
提高钢筋的强度
③
减少钢筋预应力损失
④
保证张拉施工安全
参考答案：
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《规范》规定，预应力钢筋的张拉控制应力不宜超过规定的张拉控制应力限值，且不应小于（）。
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