单项选择题
Why is it necessary to extend ventilators of gasoline powered vessels to the bilges（）.
A.To keep them dry，and thus easier to clean B.To remove fuel vapors which are heavier than air C.To provide adequate air to the engines D.To cool the machinery areas
单项选择题 While cranking out a quadrantal davit，slippage of the quadrant due to excessive wear or failure of the teeth in the quadrant will cause the（）.
单项选择题 Which term refers to a transverse curvature of the deck（）.
单项选择题 Which statement about the hospital space on a cargo ship is TRUE（）.
