Thermocouples are often used for measuring temperatures. Which of the following descriptions are val...

Thermocouples are often used for measuring temperatures. Which of the following descriptions are valid for a thermocouple?

A. A junction between two dissimilar metals generates a small voltage.
B. A semi-conductor device that exhibits a negative coefficient of resistance with temperature.
C. A resistance device that exhibits a positive coefficient of resistance with temperature.
D. A quartz crystal that changes its resonant frequency with temperature.

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参考答案: A

参考解析: 热电偶常用来测量温度，下列哪个对热电偶的描述是正确的？两种不同金属之间的连接端会产生一个小的电压。

1 单选题 1分

____ is (are) not supplied by main switchboard directly.

2 单选题 1分

____ is not a part of the main switchboard on board.

3 单选题 1分

____ is not a part of the main switch board.

4 单选题 1分

____ is not installed on the main switchboard.

5 单选题 1分