The operation of which aids to navigation may be suspended during war or national emergency（）.<br>A:Navigational satellites<br>B:Loran<br>C:Omega<br>D:Any of the above

The operation of which aids to navigation may be suspended during war or national emergency（）.
A:Navigational satellites
B:Loran
C:Omega
D:Any of the above

出自：海船船员证

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