单项选择题
The air spaces in the floor of an inflatable liferaft will provide protection against（）.
A.asphyxiation from CO2 B.loss of air in the sides of the raft C.rough seas D.cold water temperatures
单项选择题 Signaling devices which are required on inflatable liferafts include（）.
单项选择题 Signaling devices required on inflatable liferafts include a(n) （）.
单项选择题 Prior to entering a davit-launched liferaft，you should make sure that（）.
