问题
单项选择题
回波抵消的作用？（）
A.抵消MSC-TMSC间的回声
B.抵消MSC-PSTN间二四线转换产生的回波。
C.减少拨打电话时的单通现象
D.抵消PSTN-MSC-PSTN间出现的回声
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
回波抵消的作用？（）
A.抵消MSC-TMSC间的回声
B.抵消MSC-PSTN间二四线转换产生的回波。
C.减少拨打电话时的单通现象
D.抵消PSTN-MSC-PSTN间出现的回声
参考答案：B
| 完形填空：先通读下面短文，掌握其大意，然后从各小题所给A、B、C、D四个选项中选择一个最佳选项。 | ||||
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