单选题The Consol navigation system，used in Russian and Northern European waters，can be used（）.Afor precise navigation in coastal watersBby measuring the phase difference of the dots and dashesCas an aid to ocean navigationDif the vessel is fitted with a special Consol receiver
单选题
The Consol navigation system，used in Russian and Northern European waters，can be used（）.
A
for precise navigation in coastal waters
B
by measuring the phase difference of the dots and dashes
C
as an aid to ocean navigation
D
if the vessel is fitted with a special Consol receiver
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