单选题You should conduct a sector search under which of the following circumstances（）.AThe search target is sighted and then lostBMore than one vessel is available for a searchCThe search object is a target that will be readily detected by radarDAn aircraft is available to assist a surface vessel
单选题
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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