单项选择题

The ______ transmits own ship data cyclically via two defined VHF channels and receives the same data of the other ships and objects that are equipped with AIS systems．
A.AIS
B.ECDIS
C.GPS
D.VDR

A.A.AIS
B.ECDIS
C.GPS
D.VDR

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单项选择题

单项选择题

The ______ transmits own ship data cyclically via two defined VHF channels and receives the same data of the other ships and objects that are equipped with AIS systems．A.AISB.ECDISC.GPSD.VDR