A .1300
B .1785
C .1615
D .2100
[单选题]NBDP的码元中,“传号”对应的音频为()HzA .1415B .1785C .1615D .2100
[单选题]M/HFDSC的码元中,“传号”对应的音频为()HZA .1415B .1785C .1615D .2100
[单选题]VHFDSC设备中,码元传号对应的频率是:()A . 1615HZB . 1785HZC . 2100HZD . 1300HZ
[单选题]VHFDSC设备中,码元的传号对应的频率是:()A . 1615HZB . 1785HZC . 2100HZD . 1300HZ
[单选题]VHFDSC的码元中,空号对应的音频为()A .1300HZB .2100HZC .1785HZD .1615HZ
[单选题]NBDP的码元中,“1”对应的音频为()HzA .1415B .1785C .1615D .2100
[单选题]VHFDSC设备中,码元空号对应的频率是:()A . 1615HZB . 1785HZC . 2100HZD . 1300HZ
[单选题]M/HFDSC的码元中,“空号”对应的音频为()A .1415HZB .1500HZC .1785HZD . D.1615HZ
[单选题]反向闭环功控的周期为()Hz.A . 50B . 0.5C . 800D . 100
[单选题]我国采用的交流电频率为()Hz.A .30B .50C .60D .80