单项选择题
（）tankers over 100 meters long must not proceed beyond Dongbei Buoy.
A.Loading B.Load C.Lade D.Laden
单项选择题 International distress signal in VHF calling for help is（）.
单项选择题 There are salvage operations（）position 120.0N 12.5E.
单项选择题 When it is accepted to remain on the frequency indicated，you should say（）.
