If you know that the vessel you are about to call on the VHF radio maintains a radio watch on both the working and the calling frequencies，which frequency should you call on? （）<br>A:Calling frequency<br>B:Distress frequency<br>C:Urgency frequency<br>D:Working frequency

If you know that the vessel you are about to call on the VHF radio maintains a radio watch on both the working and the calling frequencies，which frequency should you call on? （）
A:Calling frequency
B:Distress frequency
C:Urgency frequency
D:Working frequency

出自：海船船员证

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