单项选择题
Automatic mechanical ventilation shutdown is required for CO2 systems protecting the（）.
A.machinery spaces B.cargo compartments C.living quarters D.galley
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（）.
单项选择题 After each reading of an oxygen indicator，the instrument should be purged with（）.
