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
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相关考题
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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 -
单项选择题
If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.
A.Skip zone
B.Blackout zone
C.Diffraction zone
D.Shadow zone
