A.fuel
B.oxygen
C.heat
D.electricity
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A.odorless
B.explosive
C.nontoxic
D.visible
A.Pump only if the discharge is led to a shore tank or barge
B.Pump only during the hours of darkness
C.Pump only on the outgoing tide
D.Pump only as much as is necessary
A.sufficient oxygen to sustain human life
B.an explosive mixture in the compartment
C.a toxic atmosphere in the compartment
D.All of the above
A.posting a fire watch in the immediate area
B.providing an extinguisher which is ready for immediate use
C.requiring the fire watch to remain on post for 30 minutes after the completion of welding or burning
D.All of the above
A.lighter than air
B.heavier than air
C.odorless
D.nontoxic
最新試題
Using a file without a handle may result in （）
The treatment of the fuel oils involves storage, heating, filtering and（）
“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
Diesel engine air start system check valves are opened by （）
During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.
The main purpose of port State control is not to（）
The condensers located in various stages of a flash evaporator are cooled by（）
If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）