单项选择题
A.the liferaft is well ventilated of excess carbon dioxide
B.all personnel have removed their life preservers to facilitate boarding
C.the door flap has been cut away and stowed inside the raft
D.All of the above
单项选择题 Prior to boarding from a vessel，a davit-launched liferaft should be well ventilated of excess（）.
单项选择题 Personnel boarding a davit-launched liferaft from a ship should be checked to assure they are not in possession of or wearing（）.
单项选择题 On inflatable liferafts，the operating cord should be renewed by（）.