单项选择题
Control of fire on a ship should be addressed（）.
A.immediately after restoring vital services B.immediately C.following control of flooding D.following establishment of fire boundaries
单项选择题 Combustible gas indicators measure the presence of combustible gas as a percentage of the（）.
单项选择题 CO2 extinguishes a fire by（）.
单项选择题 Cargo transfer operations on a tanker need NOT be stopped when（）.
