单项选择题
A.the introduction of inert gas into a tank with the object of reducing the oxygen content to below 8% by volume
B.the introduction of inert gas into a gas free tank for the purpose of reducing the oxygen content to below 8% by volume
C.the introduction of inert gas into a cargo tank during cargo discharge to replace the volume of discharged cargo
D.All of the above
单项选择题 In setting the valves on a steam-smothering system on a tank vessel，the master control valve to cargo tanks should be（）.
单项选择题 If you are fighting a fire below the main deck of your vessel，which action is most importantconcerning the stability of the vessel? （）
单项选择题 If a leak occurred while loading diethylenetriamine，the chemical data guide indicates you would smell an odor similar to（）.