You should conduct a sector search under which of the following circumstances（）.<br>A:The search target is sighted and then lost<br>B:More than one vessel is available for a search<br>C:The search object is a target that will be readily detected by radar<br>D:An aircraft is available to assist a surface vessel

You should conduct a sector search under which of the following circumstances（）.
A:The search target is sighted and then lost
B:More than one vessel is available for a search
C:The search object is a target that will be readily detected by radar
D:An aircraft is available to assist a surface vessel

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