（）is not a search pattern.

Which statement about firefighting foam is TRUE?（）

（）is a/an aircraft used in SAR.

Generally speaking，the most favorable bottom for anchoring is（）.

All the traces are（）old ones.

If you are on the beach and are signaling to a small boat in distress that your present location is dangerous and they should land to the left，you would（）.

The indication of a slipping anchor is a（n）（）.

If an airplane circles a vessel 3 times，crosses the vessel’s course close ahead while rocking the wings，and heads off in a certain direction，what does this indicate（）.

Changing rescuers while carrying out artificial respiration should be done（）.

You are approaching another vessel and see that it has the signal flag “O” hoisted．What is your next action（）.