急性肺水肿时，吸入酒精湿化氧的目的是________、_______

If there are a number of survivors in the water after abandoning ship，they should（）.

A.tie themselves to the unit so they won't drift with the current

B.form a small circular group to create a warmer pocket of water in the center of the circle

C.send the pest swimmer to shore for assistance

D.form a raft by lashing their life preservers together