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单选题
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
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单选题A loaded hopper barge with independent tanks has a placard，with alternating red and white quadrants，on each side and end. Which statement concerning this barge is TRUE?（）A
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单选题A fire of escaping liquefied flammable gas is best extinguished by（）.A
cooling the gas below the ignition pointB
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interrupting the chain reaction
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单选题You are making tow.A loaded，open-hopper barge with independent tanks has placards，with alternating red and white quadrants，located at each side and end.You inspect the barge and find slight traces of water in the wing voids due to condensation.What（）.A
Refuse to accept the barge until all wing voids are dryB
Accept the barge and when weather conditions permit run with the wing voids open to ventilate the spacesC
Accept the barge and periodically check the wing voidsD
Return the barge to the fleet and depart without the barge
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单选题You intend to tow a barge with one tug and expect continuous high winds from the north. To reduce the yaw of your tow，you should（）.A
reduce the draft of the bargeB
shorten one leg of the bridleC
place bulky deck loads as far aft as possibleD
trim the barge down by the bow
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prevent the generation of flammable or combustible gas in tanksB
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单选题An inert gas system on a tanker should be used to（）.A
prevent the generation of flammable or combustible gas in tanksB
blow out cargo lines to prevent gas concentrationsC
dilute tank atmospheres to keep gas concentrations below the lower explosive limitD
prevent fires in the pumproom by continually displacing flammable vapors
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