What's function of the duplexer in the microwave communication s
2023-11-19通信专业业务
What's function of the duplexer in the microwave communication system？（ ）
A.A、provides 2 working modes
B.B、produces 2 frequency
C.C、insulates transmit-receive
D.D、frequency conversion up and down
正确答案是C
