单项选择题
CO2 cylinders，which protect the small space in which they are stored must（）.
A.NOT contain more than 200 pounds of CO2 B.be automatically operated by a heat actuator C.have an audible alarm D.All of the above
单项选择题 CO2 cylinders equipped with pressure actuated discharge heads will discharge automatically when（）.
单项选择题 Automatic mechanical ventilation shutdown is required for CO2 systems protecting the（）.
单项选择题 An inflatable liferaft should be lifted back aboard the ship by using（）.
