單項(xiàng)選擇題It should be noted（）the use of synthetic mooring ropes able to produce sparks by their manipulation is absolutely forbidden on board petroleum tankers and LPG or LNG carriers，or any vessels carrying inflammable substances.

A.that
B.which
C.who
D.these


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1.單項(xiàng)選擇題If you have a liquefied flammable gas barge in tow，which is NOT required of you with respect to the barge and its cargo? （）

A.Make periodic inspections of bilges
B.Keep the barge under constant surveillance
C.Have a properly certificated tankerman or at least one licensed officer on board the towing vessel
D.Verify ullage readings

2.單項(xiàng)選擇題Gasoline vapor tends to collect（）.

A.above the floor plates of the bilges
B.above the carburetor level
C.at the lowest point of the bilge areas
D.at no particular level

3.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

4.單項(xiàng)選擇題Gasoline fumes tend to（）.

A.settle near the bottom of the bilge
B.settle near the top of the bilge
C.settle evenly throughout all levels of the bilge by mixing with air
D.disperse to atmosphere