三副航海英语习题讲解9

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B1727. It is used for extinguishing fires because it reduces __in the air to the point where combustion stops.

A. the concentration of oxygen

B. the temperature

C. the fuel

D. the heat

D1731. Carbon dioxide flooding system is used for extinguishing fires because it reduces the concentration of oxygen in the air to______

A .flashing point

B .combustion point C. auto-ignition point D. lower explosive limit

C2092. Except in rare cases, it is impossible to extinguish a shipboard fire by ______.

A. removing the heat

B. removing the oxygen

C. removing the fuel

D. interrupting the chain reaction

A2133. Oil fires are best extinguished by ______.

A. cutting off the supply of oxygen

B. removing the fuel

C. cooling below the ignition temperature

D. spraying with water

B2189. For most products, the fire will die out when the oxygen content is reduced to ________.

A.10%

B.12%

C.15%

D.21%

【解析】对多数物质而言，氧气含量降至12%，火将熄灭。（非常纠结）

C1465. It is necessary to secure the forced ventilation to a compartment where there is a fire to __.

A. allow the exhaust fans to remove smoke

B .extinguish the fire by carbon monoxide smothering

C. prevent additional oxygen from reaching the fire

D. protect fire fighting personnel from smoke

【解析】对一间失火的舱室，需要关闭机械通风，目的是防止有更多的氧气进入。

B1585. A galley grease fire would be classified as which class of fire?

A. A

B. B

C. C

D. D

【知识点】火灾的分类

【解析】厨房油脂失火属于B类火。

B1609. Oily rags stored in a pile that is open to the atmosphere are a hazard because they may __.

A .deteriorate and give off noxious gases B. spontaneously heat and catch fire

C. attract lice and other vermin and serve as a breeding ground

D. none of the above

【知识点】燃烧类型——自燃

【解析】在有开口的桶中存放带油的抹布是危险的，因为可能自热并引发火灾。