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[求助] 有谁知道燃料电池石墨碳板的电阻率的测试用什么仪器

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     有谁知道燃料电池用石墨碳板的电阻率的测试都用什么仪器吗?需要分别测试碳板平面方向(x-y)和厚度方向(z平方)的电阻率值,我已经问过国内的很多家做四探针电阻率测试的厂家,他们都只能测试体积电阻率,想知道哪里有满足我的测试要求的测试仪器,谢谢!
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