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
更多“On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.”相关的问题
A、A. open fire doors B、B. close fire doors C、C. put on fire doors D、D. put off fire doors
A、Lower the stern ramp，raise/open the stern door，turn on ventilation for cargo holds B、Turn on ventilation for cargo holds，raise/open the stern door，lower the stern ramp C、Turn on ventilation for cargo holds，lower the stern ramp，raise/open the stern door D、Raise/open the stern door，lower the stern ramp，turn on ventilation for cargo holds
A、There are several types of hatch covers on board ship. B、There are several types of hatches on board ship. C、There is one type of hatches on board ship. D、There is one type of hatch covers on board ship.
A、Sailors should know the SWL of cranes on board their ship. B、Sailors should know the SWL of derricks on board their ship. C、Officers should know the SWL of derricks on board their ship. D、Officers should know the SWL of cranes on board their ship.
A、Cleaning is a frequent job at sea. B、Painting is a frequent job on board a ship. C、Cleaning is a frequent job on board a ship. D、Repairing is a frequent job on board a ship.
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