单选题On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.Aprevent the passage of flammable gasesBprevent the passage of poisonous vaporsCdelay the spread of heat and flamesDmaintain watertight integrity
单选题
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
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