Which statement concerning carbon dioxide is FALSE ________．A.It displaces the oxygen in the airB.It cannot be seenC.It cannot be smelledD.It is safe to use near personnel in a confined space

题目

Which statement concerning carbon dioxide is FALSE ________．

A.It displaces the oxygen in the air

B.It cannot be seen

C.It cannot be smelled

D.It is safe to use near personnel in a confined space

相似考题

1.Carbon dioxide as a fire fighting agent has which advantage over other agents?A.It causes minimal damageB.It is safer for personnelC.It is cheaperD.It is most effective on a per unit basis

2.Which statement about entry into a space that has been sealed for a long time is TRUE ________．A.A tank that has been used to carry hazardous liquids should be tested for oxygen content，toxicity，and explosive gasesB.You can safely enter the space without a breathing apparatus if the oxygen content exceeds 14%C.The natural ventilation through the installed vents is sufficient to provide the proper oxygen contentD.The heat of the sun on upper ballast tanks，such as in a bulk carrier，may generate carbon monoxide

3.Which statement is TRUE concerning the placard entitled Discharge of Oil Prohibited ________．A.It is required on all vesselsB.It may be located in a conspicuous place in the wheelhouseC.It may be located at the bilge and ballast pump control stationD.All of the above

4.Which statement is TRUE concerning the flash point of a substance ________．A.It is lower than the ignition temperatureB.It is the temperature at which a substance will spontaneously igniteC.It is the temperature at which a substance，when ignited，will continue to burnD.It is the temperature at which the released vapors will fall within the explosive range

更多“Which statement concerning carbon dioxide is FALSE ________.A.It displaces the oxygen in t ”相关问题

  • 第1题：

    What could result in an incorrect oxygen concentration reading on the oxygen indicator ________．

    A.Exposure to carbon dioxide for no more than 1 minute

    B.Exposure to carbon dioxide for more than 10 minutes

    C.Exposure to a very low concentration of sulfur dioxide for no more than 2 minutes

    D.None of the above


    正确答案：B

  • 第2题：

    Which statement concerning locating signals in the GMDSS is FALSE ________．

    A.Locating signals are transmitted by survival craft VHF transceivers

    B.Locating signals are transmitted by SARTs

    C.Locating signals are intended to facilitate the finding of a distressed vessel or its survivors

    D.Locating signals are not transmitted by autoalarm generators


    正确答案：A

  • 第3题：

    You are underway with a tow consisting of six barges containing hazardous chemicals．Which statement is FALSE concerning a cargo information card ________．

    A.It must be carried in the pilothouse，readily available for each chemical carried

    B.It must be posted on the lead barge of the tow only

    C.It must be posted on each barge on the tow

    D.It contains information on procedure for spills or leaks


    正确答案：B

  • 第4题：

    As compared to carbon dioxide, dry chemical has which advantage? ______.

    A.Cleaner

    B.Effective on metal fires

    C.Greater range

    D.More cooling effect


    正确答案：C
    与CO2相比，干粉灭火器有哪些优点？作用距离更远.

  • 第5题：

    An Essential Scientific Process

    All life on the earth depends upon green plants. Using sunlight, theplants produce their own food. Then animals feed upon the plants. They take inthe nutrients the plants have made sted. But that’s not all.Sunlight also helps a plant produce oxygen. Some of the oxygen is used by theplant, but a plant usually produces me oxygen than it uses. The excess oxygenis necessary f animals other ganisms to live.

    The process of changing light into food oxygen is calledphotosynthesis. Besides light energy from the sun, plants also use water carbon dioxide. The water gets to the plant through its roots. The carbondioxide enters the leaves through tiny openings called stomata. The carbondioxide travels to chloplasts, special cells in the bodies of green plants.This is photosynthesis takes place. Chloplasts contain the chlophyllsthat give plants their green col. The chlophylls are the molecules thattrap light energy. The trapped light energy changes water carbon dioxide toproduce oxygen a simple sugar called glucose.

    Carbon dioxide oxygen move into out of the stomata. Watervap also moves out of the stomata. Me than 90 percent of water a planttakes in through its roots escapes through the stomata. During the daytime, thestomata of most plants are open. This allows carbon dioxide to enter the leavesf photosynthesis. As night falls, carbon dioxide is not needed. The stomataof most plants close. Water loss stops.

    If photosynthesis ceased, there would be little food other ganicmatter on the earth. Most ganisms would disappear. The earth’s atmospherewould no longer contain oxygen. Photosynthesis is essential f life on ourplanet.

    　　词汇：

    nutrient n.营养物

    ganism n.生物体，有机体

    carbon dioxide n.二氧化碳

    chloplast n.叶绿体

    molecule n.分子

    vap n.水蒸气

    oxygen n.氧气

    photosynthesis n.光合作用

    chlophyll n.叶绿素

    glucose n.葡萄糖

    cease v.停止

    　　注释：

    1.Then animals feed upon the plants.动物以植物为食。

    　　练习：

    4.This passage is primarily developed by

    A.explaining a process.

    B.telling a sty.

    C.comparing contrasting.

    D.convincing the reader of plants’ imptance.


    答案：A
    解析：
    4.A　文章先是介绍了进行光合作用所需的原料和组织，又介绍了光合作用的过程，因此整个逻辑应该是解释过程，而不是讲故事或比较对比。D项是“向读者说明植物的重要性”，这确实是文章的一个目的，但不是文章的组织方式。

  • 第6题：

    单选题
    As compared to carbon dioxide，dry chemical has which advantage?（）.
    A

    Cleaner

    B

    Effective on metal fires

    C

    Greater range

    D

    More cooling effect


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    Which statement concerning the collection of fresh water is FALSE?（）
    A

    Fresh water may be obtained from fish

    B

    lifeboat covers or canopies should be washed with rain before drinking water is collected

    C

    Fresh water may be collected from condensation inside the life-raft

    D

    Freshwater cannot be produced from standing seawater


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    Which general statement concerning radar is FALSE?（）.
    A

    Raising the antenna height increases the radar range

    B

    The ability of radar to detect objects is unaffected by weather conditions

    C

    Radar bearings are less accurate than radar ranges

    D

    Radar should be checked regularly during clear weather to ensure that it is operating properly


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    As compared to carbon dioxide,dry chemical has which advantage?（）.
    A

    Cleaner

    B

    Effective

    C

    Greater range

    D

    More cooling effect


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    Which statement concerning the handling characteristics of a fully loaded vessel as compared with those of a light vessel is FALSE?（）
    A

    A fully loaded vessel will be slower to respond to the engines

    B

    A fully loaded vessel will maintain her headway further

    C

    A light vessel will be more affected by the wind

    D

    A light vessel lose more rudder effect in shallow water


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    Which statement is FALSE concerning Concatenation？（）
    A

    It allows ITCM to send multiple upstream packets in one single large burst.

    B

    It reduces upstream data throughput.

    C

    It can be enabled/disabled from CMTS on per upstream port basis if desired

    D

    Concatenation activity on an interface can be checked by the show controller counters command


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    Why should you wear a self-contained breathing apparatus before entering the engine room after the fixed CO2 system has been discharged to combat a major fire?（）
    A

    Because carbon dioxide dilutes the oxygen concentration in the atmosphere and may cause asphyxiation

    B

    Because carbon dioxide breaks down in a fire into carbon monoxide which may cause blood poisoning in the person breathing this gas

    C

    Because carbon dioxide is a colorless and odorless gas that becomes highly toxic in the presence of high temperatures and will quickly incapacitate a person exposed to this gas

    D

    This action is unnecessary as carbon dioxide is not poisonous nor toxic but is a relatively harmless gas


    正确答案： C
    解析： 暂无解析

  • 第13题：

    Which statement concerning GPS is TRUE ________．

    A.It cannot be used in all parts of the world

    B.There are 12 functioning GPS satellites at present

    C.It may be suspended without warning

    D.Two position lines are used to give a 2D fix


    正确答案：C

  • 第14题：

    Which statement concerning the application of dry chemical powder is FALSE ________．

    A.At temperatures of less than 32℉，the extinguisher must be recharged more often

    B.When possible，the fire should be attacked from windward

    C.The stream should be directed at the base of the fire

    D.Directing the stream into burning flammable liquid may cause splashing


    正确答案：A

  • 第15题：

    ______, as the chemical extinguisher agent, should be used for an electric fire.

    A.dry chemical or foam

    B.foam or soda acid

    C.carbon dioxide or foam

    D.carbon dioxide or dry chemical


    正确答案：D
    二氧化碳或干粉灭火器作为化学灭火器，用于扑灭电器火灾。

  • 第16题：

    An Essential Scientific Process

    All life on the earth depends upon green plants. Using sunlight, theplants produce their own food. Then animals feed upon the plants. They take inthe nutrients the plants have made sted. But that’s not all.Sunlight also helps a plant produce oxygen. Some of the oxygen is used by theplant, but a plant usually produces me oxygen than it uses. The excess oxygenis necessary f animals other ganisms to live.

    The process of changing light into food oxygen is calledphotosynthesis. Besides light energy from the sun, plants also use water carbon dioxide. The water gets to the plant through its roots. The carbondioxide enters the leaves through tiny openings called stomata. The carbondioxide travels to chloplasts, special cells in the bodies of green plants.This is photosynthesis takes place. Chloplasts contain the chlophyllsthat give plants their green col. The chlophylls are the molecules thattrap light energy. The trapped light energy changes water carbon dioxide toproduce oxygen a simple sugar called glucose.

    Carbon dioxide oxygen move into out of the stomata. Watervap also moves out of the stomata. Me than 90 percent of water a planttakes in through its roots escapes through the stomata. During the daytime, thestomata of most plants are open. This allows carbon dioxide to enter the leavesf photosynthesis. As night falls, carbon dioxide is not needed. The stomataof most plants close. Water loss stops.

    If photosynthesis ceased, there would be little food other ganicmatter on the earth. Most ganisms would disappear. The earth’s atmospherewould no longer contain oxygen. Photosynthesis is essential f life on ourplanet.

    　　词汇：

    nutrient n.营养物

    ganism n.生物体，有机体

    carbon dioxide n.二氧化碳

    chloplast n.叶绿体

    molecule n.分子

    vap n.水蒸气

    oxygen n.氧气

    photosynthesis n.光合作用

    chlophyll n.叶绿素

    glucose n.葡萄糖

    cease v.停止

    　　注释：

    1.Then animals feed upon the plants.动物以植物为食。

    　　练习：

    5.Another good title f this passage would be

    A.Oxygen Carbon Dioxide.

    B.Plants Their Roots.

    C.How Photosynthesis Wks.

    D.Why Our Earth Needs Water.


    答案：C
    解析：
    5.C　文章的主题是光合作用的基本原理，因此选项C。A、B项在文中有提及，但不是主旨，D项与本文无关

  • 第17题：

    An Essential Scientific Process

    All life on the earth depends upon green plants. Using sunlight, theplants produce their own food. Then animals feed upon the plants. They take inthe nutrients the plants have made sted. But that’s not all.Sunlight also helps a plant produce oxygen. Some of the oxygen is used by theplant, but a plant usually produces me oxygen than it uses. The excess oxygenis necessary f animals other ganisms to live.

    The process of changing light into food oxygen is calledphotosynthesis. Besides light energy from the sun, plants also use water carbon dioxide. The water gets to the plant through its roots. The carbondioxide enters the leaves through tiny openings called stomata. The carbondioxide travels to chloplasts, special cells in the bodies of green plants.This is photosynthesis takes place. Chloplasts contain the chlophyllsthat give plants their green col. The chlophylls are the molecules thattrap light energy. The trapped light energy changes water carbon dioxide toproduce oxygen a simple sugar called glucose.

    Carbon dioxide oxygen move into out of the stomata. Watervap also moves out of the stomata. Me than 90 percent of water a planttakes in through its roots escapes through the stomata. During the daytime, thestomata of most plants are open. This allows carbon dioxide to enter the leavesf photosynthesis. As night falls, carbon dioxide is not needed. The stomataof most plants close. Water loss stops.

    If photosynthesis ceased, there would be little food other ganicmatter on the earth. Most ganisms would disappear. The earth’s atmospherewould no longer contain oxygen. Photosynthesis is essential f life on ourplanet.

    　　词汇：

    nutrient n.营养物

    ganism n.生物体，有机体

    carbon dioxide n.二氧化碳

    chloplast n.叶绿体

    molecule n.分子

    vap n.水蒸气

    oxygen n.氧气

    photosynthesis n.光合作用

    chlophyll n.叶绿素

    glucose n.葡萄糖

    cease v.停止

    　　注释：

    1.Then animals feed upon the plants.动物以植物为食。

    　　练习：

    2.Which of the following does not move through a plant’s stomata?

    A.Carbon dioxide.

    B.Water vap.

    C.Oxygen.

    D.Food.


    答案：D
    解析：
    2.D　从第三段的第一、二句得知，二氧化碳、氧气和水蒸气都能从气孔中通过，唯一一个没有提到的是food“养分、食物”，因此该题选D项。

  • 第18题：

    填空题
    Glucose can be completely broken down into carbon dioxide and water when oxygen is present in the process called aerobic respiration.____

    正确答案： H
    解析：
    根据题干信息“carbon dioxide, oxygen”可以定位到H段“When oxygen is present, glucose can be completely broken down into carbon dioxide and water in a process called aerobic respiration”，故匹配段落为H段。

  • 第19题：

    单选题
    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


    正确答案： B
    解析： 暂无解析

  • 第20题：

    单选题
    Which statement is FALSE concerning the interleave depth value？（）
    A

    A higher interleave depth provides more protection from burst of noise on the HFC network

    B

    Higher interleave depth increase downstream latency

    C

    Lower interleave depth cause some packet loss on typical HFC networks

    D

    None ofthe above


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent?（）
    A

    Carbon dioxide is corrosive when exposed to fire

    B

    Carbon dioxide should be applied slowly to a large engine room fire

    C

    Its total cooling effect is far greater than water

    D

    Its smothering effect is excellent for class B fires


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    Which statement concerning locating signals in the GMDSS is FALSE（）.
    A

    Locating signals are transmitted by survival craft VHF transceivers

    B

    Locating signals are transmitted by SARTs

    C

    Locating signals are intended to facilitate the finding of a distressed vessel or its survivors

    D

    Locating signals are not transmitted by autoalarm generators


    正确答案： A
    解析： 暂无解析

  • 第23题：

    单选题
    Which statement concerning the collection of fresh water is FALSE?（）
    A

    Fresh water may be obtained from fish

    B

    Lifeboat covers or canopies should be washed with rain before drinking water is collected

    C

    Fresh water may be collected from condensation inside the liferaft

    D

    Seawater should never be consumed


    正确答案： A
    解析： 暂无解析

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