單項選擇題

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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單項選擇題

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

單項選擇題

Loran-C is which type of system（）.

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

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Most modern Loran-C receivers，when not tracking properly，have a（n）（）.

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Loran-C uses the multiple pulse system because（）.

Loran-C is which type of system（）.

Most modern Loran-C receivers，when not tracking properly，have a（n）（）.