【单选题】【消耗次数：1】
高碳钢淬火后回火时,随回火温度升高其（）。
①
强度硬度下降,塑性韧性提高
②
强度硬度提高 ,塑性韧性下降
③
强度韧性提高,塑性硬度下降
④
强度韧性下降,塑性硬度提高
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