单项选择题
A tourniquet should be used to control bleeding ONLY（）.
A.with puncture wounds B.when all other means have failed C.when the victim is unconscious D.to prevent bleeding from minor wounds
单项选择题 Preventer bars are fitted on lifeboat releasing hooks to prevent（）.
单项选择题 The control lever for the mechanical disengaging apparatus in a lifeboat shall（）.
单项选择题 A flooded lifeboat on board a vessel would adversely affect the vessel’s stability by（）.
