On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.<br>A:prevent the passage of flammable gases<br>B:prevent the passage of poisonous vapors<br>C:delay the spread of heat and flames<br>D:maintain watertight integrity

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

出自：海船船员证

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