单项选择题

All the traces are（）old ones.

A.Clear
B.Evident
C.Obvious
D.Apparently

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单项选择题
A VESSEL，OTHER THAN A RESCUE UNIT，DESIGNATED TO CO-ORDINATE SURFACE SEARCH AND RESCUE OPERATION WITHIN A SPECIFIED AREA is known as（）.

A.Salving vessel
B.Co-ordinator surface search
C.MERSAR
D.The vessel being salved
单项选择题
（）is not a search pattern.

A.Williamson Turn
B.Parallel
C.Sector
D.zig-zag maneuver
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