题目：
低碳钢拉伸过程经历了哪几个阶段？各阶段有何特点？低碳钢拉伸过程的指标如何？
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
低碳钢拉伸过程经历了哪几个阶段？各阶段有何特点？低碳钢拉伸过程的指标如何？
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