A .0
B .4.6MHZ
C .25KHZ
D .50KHZ
[单选题]船用VHF双工工作时,收发频率差为()。A .406MHzB .4.6MHzC .25KHzD . D.50KHz
[单选题]VHF设备工作在双工工作方式时,收发频率差为().A .406MHzB .4.6MHzC .25kHzD . D.50kHz
[单选题]下述VHF频道中哪一个是双工频道()。A .16B .26C .06D . D.13
[单选题]船用VHF设备共划分成()频道A . 88B . 57C . 28D . 70
[单选题]船用VHF设备共分为()个频道A . 88B . 57C . 28D . 70
[单选题]船用VHF设备共划分为()ITU频道A .88B .57C .28D .70
[单选题]船用VHF中频道间隔为()KHZA . 50B . 10C . 25D . 5
[单选题]VHF设备双工信道的收发频率间隔是()。A .4.6KHzB .25KHzC .50KHzD . D.12.5KHz
[单选题]船用VHF电话ITU的最小频道间隔为()。A .50KHzB .25KHzC .12.5KHzD .5KHz
[单选题]VHF设备的频道间隔为()A .10KHZB .25KHZC .15KHZD . D.20KHZ