单项选择题
A.Clear B.Evident C.Obvious D.Apparently
A.Salving vessel B.Co-ordinator surface search C.MERSAR D.The vessel being salved
A.Williamson Turn B.Parallel C.Sector D.zig-zag maneuver
A.MERSAR B.IMOSAR C.ICAO SAR D.SOSREP
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