试题详情
- 单项选择题Which statement best describes echo?（）
A、Echo is the discernable leak-through of your own Rx path into your own Tx path.
B、Echo is the discernable leak-through of the packets of your Rx path into your own Tx path.
C、Echo is the nonaudible leak-through of the packets of your Rx path into your own Tx path.
D、Echo is the audible leak-through of the packets from the transmit path into your own receive path.
E、Echo is the nonaudible leak-through of the packets of your Tx path into your own Rx path.
- D
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