单选题To ensure quality， what is the maximum end-to-end transit time in milliseconds on a voice network？（）A 50B 100C 150D 200E 250
单选题
To ensure quality， what is the maximum end-to-end transit time in milliseconds on a voice network？（）
A
50
B
100
C
150
D
200
E
250
参考解析
解析：
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