单项选择题
A.AIS B.ECDIS C.GPS D.VDR
Radar makes the most accurate determination of the（）.A....
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
Most modern Loran-C receivers，when not tracking properl...
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
Loran-C uses the multiple pulse system because（）.A.Less...
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
