?空闲信道状态

... 空闲信道检测 idle channel detection 空闲信道状态 idle channel state 空闲信道测量 Idle channel measurements ...

?空闲的信道状态

... idle channel noise 空闲信道的噪声... idle channel state 空闲的信道状态... idle character 空转字符...

?空闲通道状态

... idle channel loading ==> 空信道加荷 idle channel state ==> 空闲通道状态 idle circuit ==> 无效电路 ...