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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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单选题No navigational aids are shown and chart is not kept corrected for alterations in depths inside the pecked lines. For more detailed information, the larger scale charts must be（）.A
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on loran charts covering areas where sky waves are usedB
in the Radio Aids to Navigation，PUB 117C
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