單項選擇題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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題Generally speaking , the heavier cargo will go into the（）,distributing it evenly fore and aft, the lighter cargo will probably be placed in the（）.

A.deep tanks/lower holds
B.lower holds/tweendecks
C.tweendecks/deep tanks
D.deep tanks/tweendecks

4.單項選擇題Holes in the bulwark,Which allow deck water to drain into the sea, are（）.

A.doggers
B.fidleys
C.freeing ports
D.swash ports

5.單項選擇題How should cargo tank hatches be protected when the ullage opening is open and the tank not gas free?（）.

A.With gooseneck vents
B.With warning signs
C.With flame screens
D.With pressure-vacuum relife valves