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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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更多 “ On a ship，a door that is required to be marked KEEP CLOSED is designed to ______．A.prevent the passage of flammable gasesB.prevent the passage of poisonous vaporsC.delay the spread of heat and flamesD.maintain watertight integrity ” 相关考题
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