已知K型热电偶的热端温度为300℃，冷端温度为20℃。查热电偶分度表得电势：300℃时为12.209mV，20℃时为0.798mV，280℃时为11.282mV。这样，该热电偶回路内所发出的电势为( )mV。
A．11.382
B．11.411
C．13.007
D．12.18
参考答案：B
解析： 根据中间温度定律E(t，0)=E(t，t0)+E(t0，0)，有
E(300，0)=E(300，20)+E(20，0)
E(300，20)=E(300，0)-E(20，0)=12.209-0.798=11.411。
补全对话（共5小题；每小题1分，满分5分） A：Today we are going to talk about a great invention．It looks like a human being． 小题1: B：It’s a robot．小题2: A：Of course not．The first robot was invented in 1921． B：小题3: A：Sure．They can take the place of humans to do some boring work．They can also do a lot of dangerous work instead of humans． B： 小题4: A：No．Robots can do a lot of work instead of people in many ways，but people wouldn’t be replaced by robots． 小题5: B： We get it．
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