【单选题】【消耗次数：1】
冷拔低碳钢丝是按如下工艺形成的：
①
强力张拉
②
人工时效
③
冷拔
④
电热法
参考答案：
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钢材经冷拉时效处理后,其特性有何变化（ ）。
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屈服点提高、抗拉强度降低、塑性韧性降低
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用冷拉应力控制钢筋冷拉，冷拉后，钢筋长短不一，对要求等长或定长的预应力筋难以满足要求
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用冷拉应力控制钢筋冷拉，冷拉后屈服点不稳定
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