On a ship,a door that is required to be marked KEEP CLOSED is designed to ______.
A.prevent the passage of flammable gases
B.prevent the passage of poisonous vapors
C.delay the spread of heat and flames
D.maintain watertight integrity
第1题
A.full ahead
B.full astern
C.half ahead
D.slow astern
第2题
A.Rich to burn
B.Lean to burn
C.Cool to burn
D.Dense to burn
第3题
A.Flow of petroleum through pipes
B.Spraying or splashing of petroleum
C.Settling of solids or water in petroleum
D.All of the above
第4题
A.moved
B.tipped or dragged
C.removed
D.put
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