单选题The loran lines drawn on navigation charts represent().AGround wavesBSkywavesCEither ground waves or skywaves interchangeablyDAn average between ground wave and skywave positions

单选题
The loran lines drawn on navigation charts represent().
A

Ground waves

B

Skywaves

C

Either ground waves or skywaves interchangeably

D

An average between ground wave and skywave positions


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