A group of crew members standing by in case of an emergency in order to assist other teams in action if necessary is a（）.

A pattern according to which vessels and or aircraft may conduct a co-ordinated search is a（）.

A.Research pattern
B.Research mode
C.Search pattern
D.Search and rescue mode

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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

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