单项选择题
Where should the tops of vents from gasoline tanks terminate?（）.
A.In open air B.Inside cabins near the overhead C.In the machinery space near the engine air intake D.Underwater
单项选择题 Where is thicker plating usually found in the construction of integral tanks on a ship? （）
单项选择题 When fueling has been completed（）.
单项选择题 When fighting fires in spaces containing bottles of LPG (liquefied petroleum gas)，you should （）.
