A.mark the position of a lost mooring
B.determine your vessel's sideslip underway
C.determine your speed through the water
D.indicate location of a man overboard
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You should conduct a sector search under which of the following circumstances（）.
You are proceeding to a distress site．The survivors are in liferafts.What will make your ship more visible to the survivors（）.
Stop search and return to（）.
In case of your steering gear failed，（）should be exhibited in shapes or lights.
Which statement about firefighting foam is TRUE?（）
The self-contained breathing device should not be used in which situation（）.
All the traces are（）old ones.
During an annual FCC inspection（）.
Changing rescuers while carrying out artificial respiration should be done（）.
（）is a/an aircraft used in SAR.