单项选择题

Floors aboard ship are（）.

A.frames to which the tank top and bottom shell are fastened on a double bottomed ship
B.transverse members of the ships frame which support the decks
C.longitudinal beams in the extreme bottom of a ship from which the ships ribs start
D.longitudinal angle bars fastened to a surface for strength

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单项选择题

Frames to which the tank top and bottom shell are fastened are called（）.

A.floors
B.intercostals
C.stringers
D.tank top supports

单项选择题

Freeing ports on a vessel with soild bulwards（）.

A.prevent stress concentration in the bulwark
B.permit easy jettison of deck cargo in an emergency
C.provide opening through the bulwarks for mooring lines
D.allow water shipped on deck to flow off rapidly

单项选择题

Fuel oil tank vents are fitted with a screen which will stop（）.

A.oil from flowing out of the tank vent
B.air from entering the tank vent
C.vapors from leaving the tank vent
D.flames on deck from entering the tank vent