单项选择题
A.Ground waves B.Skywaves C.Either ground waves or skywaves interchangeably D.An average between ground wave and skywave positions
The line connecting the Loran-C master station with a s...
单项选择题The line connecting the Loran-C master station with a secondary station is called the（）.
A.Focus line B.Base line C.Side line D.Center line
The information received by AIS will be displayed on（）....
单项选择题The information received by AIS will be displayed on（）.
A.DCU B.UTC C.ENC D.MENU
The（）transmits own ship data cyclically via two defined...
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
