Planned conversations usually degenerate into silence or involve only a small number of students.()
What is the fundamental purpose for imposing radio silence? ()
How is “radio silence” imposed?()
When can routine communications be resumed when radio silence has been imposed?()
What is meant by the term “radio silence”?()
why do some stations keep silence?()
在NBDP遇险通信中,SILENCE MAYDAY表示()使用的信号
在NBDP遇险通信中,SILENCE MAYDAY表示()使用的信号