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当前学科：无损检测技术资格人员考试
题目：
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用自动化操纵系统对材料进行涡流检验时，灵敏度按照什么进行校准和调整最好？（）
A . 一些电子源；
B . 另一种无损试验方法；
C . 一个NBS标准；
D . 一个被检验的实际零件
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