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
相关考题
-
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 -
单项选择题
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 -
单项选择题
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
