单选题If（）is shut down for an extended time optimum position fixing will take up to 2 hours after power is reapplied．AradarBDFCSatellite NavigatorDAutomatic Omega Navigator
单选题
If（）is shut down for an extended time optimum position fixing will take up to 2 hours after power is reapplied．
A
radar
B
DF
C
Satellite Navigator
D
Automatic Omega Navigator
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