单项选择题
LFG tank and pipeline maintenance should include（）.
A.exclusion of all sand and solid matter
B.cleaning with clean fresh or sea water
C.examination for fractures and pitting
D.All of the above
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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
