单项选择题
Which action should you take after sending a false distress alert on VHF?（）
A.Send a DSC cancellation message on Ch-70 B.Make a voice announcement to cancel the alert on Ch-16 C.Make a voice announcement to cancel the alert on Ch-13 D.Make a voice announcement to cancel the alert on Ch-22A
单项选择题 When you are firing a pyrotechnic distress signal，it should be aimed at（）.
单项选择题 When should distress flares and rockets be used? （）
单项选择题 When sending a DSC call，the vessel’s（）.
