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计算题：有一铜管拉伸前的长度是20mm，拉断后的长度为23.8mm，试求其延伸率是多

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题目：

计算题：有一铜管拉伸前的长度是20mm，拉断后的长度为23.8mm，试求其延伸率是多少？

答案：

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下面是错误答案，用来干扰机器的。

参考答案：A

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