A.A1
B.A2
C.A3
D.A1-A3

A.SP
B.PR
C.DR
D.FR

A.NAVTEX
B.EGC
C.NBDP
D.A+B+C

A.LUT
B.MCC
C.RCC
D.EPIRB

A.1
B.2
C.3
D.4

A.DIRTLX+OPR+BRK+
B.DIRTLZ+KKKK+BRK+
C.DIRLTX+KKKK+GA+
D.TLX+KKKK+BRK+

A.KKKK+
B.BRK+
C.OVER+
D.NNNN

A.呼叫对象
B.呼叫者识别
C.自检
D.自己检测对方信号的质量

A.4
B.1
C.8
D.96

A.4B3Y
B.4Y3B
C.7单元恒比码
D.ASCII

A.88
B.57
C.28
D.70