试题与答案

电信一般指利用( ),对于( )或者任何性质的信息( )。 A.有线电、无线电

题型:单项选择题

题目:

电信一般指利用( ),对于( )或者任何性质的信息( )。

A.有线电、无线电,消息、文字,传输、接收
B.有线电、光或者其他电磁系统,图像、声音,发射和接收
C.无线电、光或者其他电磁系统,文字、图像,传输、发射和接收
D.有线电、无线电、光或者其他电磁系统,消息、文字、图像、声音,传输、发射和接收

答案:

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参考答案:探究生长素浓度对植物枝条生根数量的影响

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