On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.
- Aprevent the passage of flammable gases
- Bprevent the passage of poisonous vapors
- Cdelay the spread of heat and flames
- Dmaintain watertight integrity
问题
On a ship，a door that is required to b
参考解析：
分类：船舶设备名称题库
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