單項(xiàng)選擇題

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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單項(xiàng)選擇題

Loran-C is which type of system（）.

A.Reflected electron
B.Electrical radiation
C.Quarterpoint electrical navigation
D.Hyperbolic radio navigation

單項(xiàng)選擇題

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