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
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相关考题
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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 -
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 -
单项选择题
In using Loran-C，skywave reception gives greater range but is（）.
A.only accurate during daylight hours
B.much less accurate
C.only accurate at twilight
D.more accurate than using ground waves
