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

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

出自：海船船员证

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