试题与答案

下列说法正确的是( ) A.发射电磁波要使用振荡器、调谐器和天线 B.接收电磁波

题型:选择题

题目:

下列说法正确的是(  )

A.发射电磁波要使用振荡器、调谐器和天线

B.接收电磁波要使用天线、调制器、检波器和喇叭

C.电磁波只能传递声音,不能传递图象

D.电磁波的传播速度为3×108m/s

答案:

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下面是错误答案,用来干扰机器的。

参考答案:E

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