A “fifteen-pound” CO2 extinguisher is so called because（）.

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• A safety outlet is provided on the CO2 discharge piping to prevent（）.

  A . over pressurization of the space being flooded B . rupture of cylinder due to temperature increase C . over pressurization of the CO discharge piping D . flooding of a space where personnel are present

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• How do you operate a portable CO2 fire extinguisher?（）.

  A . Point the horn down B . Turn cylinder upside-down C . Break the rupture disc D . Pull pin，squeeze gri

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• CO2 extinguishes a fire by （）.

  A . a blanket of bubbles formed on the surface of the fire B . smothering C . cooling D . isolating the heat from the fuel

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• When using carbon dioxide to fight a fire on a bulkhead，the CO2 should be applied（）.

  A . first to the bottom of the flaming area，sweeping from side to side，and following the flames upward B . in a circular motion from the middle of the bulkhead outward C . to the top of the flaming area，sweeping from side to side，and working toward the bottom D . in an up-and-down motion from one side of the bulkhead to the other

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• After extinguishing a fire with CO2，it is advisable to（）.

  A . use all CO available to cool the surrounding area B . stand by with water or other agents C . thoroughly ventilate the space of CO D . jettison all burning material

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• C和Si都是ⅣA族元素，所以CO2和SiO2都是分子晶体。()

  A . 正确 B . 错误

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• 用瓦斯鉴定器测定A点CO2时，首先测得A点CH4为2%，当甩掉苏打石灰吸收管测定时，鉴定管读数为4%，则CO2含量为（）

  A . 2% B . 4% C . 1.91% D . 3.82%

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• A CO2 extinguisher on a ship which has lost 10% of its charge must be（）.

  A . used at the earliest opportunity B . hydrotested C . recharged D . weighed again in one month

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• A CO2 portable extinguisher is annually checked by（）.

  A . reading the gage pressure B . weighing the extinguisher C . discharging a small amount of CO D . seeing if the seal has been broke

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• A fixed CO2 system on a ship with a capacity of over 300 lbs (136 kilograms) CO2 which protects spaces other than tanks must have（）.

  A . two or more releasing stations B . automatic release in event of a fire C . an audible alarm and time delay D . an audible and visible alarm

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• STM32的外部中断/事件控制器（EXTI）支持的中断/事件请求个数是（）

  A . 16 B . 19 C . 25 D . 30

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• A fifteen-pound CO2 extinguisher（）.

  A . contains 15 pounds of CO B . weighs 15 pounds when full of CO C . has 15 pounds of pressure at the nozzle D . weighs 15 pounds when empty

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• 酵母菌无氧呼吸产生A摩尔的CO2。，人在正常情况下消耗同样量的葡萄糖，可形成CO2（）

  A . 2/5A摩尔 B . 1/12A摩尔 C . 6A摩尔 D . 3A摩尔

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• How long warning must be provided by the CO2 warning Mann before CO2 is discharged into a space （）.

  A . 5 seconds B . 10 seconds C . 15 seconds D . 20 second

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• CO2 extinguishes a fire by（）.

  A . cooling B . smothering C . chemical action D . All of the above

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• After using a CO2 extinguisher on a ship，it should be（）.

  A . put back in service if some CO remains B . hydrostatically tested C . retagged D . recharged

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• Co2+、Ni2+、Mn2+水合离子半径大小次序是（)。A．CO2+＞Ni2+＜Mn2+B．Co2+＜Ni2+＜Mn2+C．Ni2+＜Co2+＜Mn2

  Co2+、Ni2+、Mn2+水合离子半径大小次序是()。 A．CO2+＞Ni2+＜Mn2+ B．Co2+＜Ni2+＜Mn2+ C．Ni2+＜Co2+＜Mn2+ D．Co2+＞Ni2+＞Mn2+

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• 通常所说的煤气中毒实际上是（)中毒。A.CO2B.COC.CO2+COD.CH4

  通常所说的煤气中毒实际上是()中毒。 A.CO2 B.CO C.CO2+CO D.CH4

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• 植物光合作用释放的氧气来源于A．CO2

  B．H2O

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• CO2气瓶外涂（）A色，并标有CO2字样

  A．铝白 B．银灰 C．黑色 D．天蓝

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• STM32的EXTI线16连接到PVD输出。（)

  是 否

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• STM32的EXTI线18连接到USB唤醒事件。（)

  是 否

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• HCO3的共轭碱是（)。A、CO2

  B、CO32- C、H2CO3 D、H2O E、OH-

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• 1、粗丝CO2气体保护焊时的飞溅_____细丝CO2气体保护焊时的飞溅。A A 大于 B 等于 C 小于

  A．大于 B．等于 C．小于 D．不确定

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