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[单选题]
热电偶测量温度时()
A
需加正向电压b.需加反向电压c.加正向、反向电压都可以d.不需加电压
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参考答案
试题答案:
D
答案解释:
热电偶是热电型传感器,两端有温度差时可以产生热电动势,所以不需外加电压。
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