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

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单项选择题

Radar makes the most accurate determination of the（）.

A.direction of a target
B.distance to a target
C.size of a target
D.shape of a target

单项选择题

Most modern Loran-C receivers，when not tracking properly，have a（n）（）.

A.Bell alarm to warn the user
B.Lighted alarm signal to warn the user
C.Alternate signal keying system
D.View finder for each station

单项选择题

Loran-C uses the multiple pulse system because（）.

A.Less signal energy is necessary for receiver operation
B.More signal energy is available at the receiver
C.It significantly increases the peak power
D.It increases the signal capacity