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单选题

当两架或更多架飞机回答的识别码相同时,地面调度人员分辨不清,这时可以要求其中一架飞机在发完识别码以后,再加上一个(),以示区别。

A
询问脉冲
B
SPI脉冲
C
PCM脉冲
D
PAM脉冲

答案解析

正确答案:B
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