单项选择题
（）tankers over 100 meters long must not proceed beyond Dongbei Buoy.
A.Loading
B.Load
C.Lade
D.Laden
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International distress signal in VHF calling for help is（）.
A.Help，Help，Help
B.Mayday，Mayday，Mayday
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When it is accepted to remain on the frequency indicated，you should say（）.
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