单项选择题
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
Loran-C is which type of system（）.A.Reflected electronB...
单项选择题Loran-C is which type of system（）.
A.Reflected electron B.Electrical radiation C.Quarterpoint electrical navigation D.Hyperbolic radio navigation
