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

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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（）.

A.Davit arm to pivot on the traveling nut and the head to fall outboard
B.Traveling nut to lock up in place on the worm gear
C.Limit switch to engage and hold the traveling nut in position
D.Winch brake to lock in position and prevent lowering the boat

单项选择题

Which term refers to a transverse curvature of the deck（）.

A.Deadrise
B.Camber
C.Freeboard
D.Flare

单项选择题

Which statement about the hospital space on a cargo ship is TRUE（）.

A.The hospital may be used for disciplinary confinement if it is not being used for treatment
B.The hospital space must have both a bathtub and shower
C.A hospital is required on all vessels with a crew of 12 or more if it makes overnight voyages
D.If a ship has a crew of forty-five who do not have their own room，the hospital must have four berths