单项选择题
CO2 cylinders equipped with pressure actuated discharge heads will discharge automatically when（）.
A.the discharge valve is open B.the control box glass is broken C.pressure from the control cylinders is detected D.the control cylinders have been completely discharged
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（）.
单项选择题 After using a CO2 extinguisher on a ship，it should be（）.
