【单选题】【消耗次数：1】
钢筋经冷拉后（ ）。
①
屈服强度提高但塑性降低
②
屈服强度提高但塑性不变
③
屈服强度提高且塑性也提高
④
强度与塑性均降低
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【判断题】
将冷加工处理后的钢筋，在常温下存放15～20 d，或加热至100～200 ℃后保持一定时间（2～3 h），其屈服强度进一步提高，且抗拉强度也提高，同时塑性和韧性也进一步降低，弹性模量则基本恢复，这个过程称为时效处理。
①
正确
②
错误
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