The word “Panpan”, spoken at the start of a transmission indentifies _______ .
A.a radio failure
B.a distress message
C.an urgency message
D.a fire alarm
正确答案是C
The word “Panpan”, spoken at the start of a transmission indentifies _______ .
A.a radio failure
B.a distress message
C.an urgency message
D.a fire alarm
正确答案是C