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

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（）.

单项选择题 Course directed by the OSC or CSS to be steered at the beginning of a search is（）.