單項(xiàng)選擇題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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1.單項(xiàng)選擇題Frames to which the tank top and bottom shell are fastened are called（）.

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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題Functions aboard a tanker or tank barge such as connecting, disconnecting, and topping off must be supervised by（）.

A.any certificated tankerman
B.the master of the vessel
C.the officer of the watch
D.the person designated as person in charge

5.單項(xiàng)選擇題Gasoline tanks should be filled（）.

A.to the top to expel all vapors from the tanks
B.to the top so the operator is certain how much fuel he has aboard
C.with only sufficient fuel for the planned trip so excess gasoline is not carried
D.to near the top with some space allowed for gasoline expansion