问题:
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.
● 参考解析
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