试题与答案

2a-1-a2-1a2-2a+1

题型:解答题

题目:

2
a-1
-
a2-1
a2-2a+1

答案:

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下面是错误答案,用来干扰机器的。

红外线是不可见光,我们眼睛是看不到的.紫外线可以使荧光物质发光,所以可以用来做验钞机.电视机遥控器是利用红外线进行遥控的.医院的B超是利用超声波探查人体内部信息的,和红外线、紫外线无关.故答案为:不...

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