试题与答案

PCM30/32系统收端时钟产生的方法是() A.用石英晶体震荡器产生 B.定时钟提

题型:单项选择题

题目:

PCM30/32系统收端时钟产生的方法是()

A.用石英晶体震荡器产生

B.定时钟提取

C.外同步定时法

D.用原子钟产生

答案:

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