Gas masks ______.A.should be worn while fighting a fireB.can be used in atmospheres deficient in oxygenC.filter contaminants from air that is to be breathedD.may be substituted for a self-contained breathing apparatus

题目

Gas masks ______.

A.should be worn while fighting a fire

B.can be used in atmospheres deficient in oxygen

C.filter contaminants from air that is to be breathed

D.may be substituted for a self-contained breathing apparatus

相似考题

1.Who had gas masks?A． Everybody.B． A part of the protestors.C． The policemen.D． Both B and C．

2.The expansion valve used in a refrigeration system regulates theA.superheat of the gas leaving the compressorB.back pressure in the evaporatorC.temperature in the refrigerated spaceD.degree of superheat of the gas leaving the evaporator

3.An inert gas system on a tanker should be used to ______.A.prevent the generation of flammable or combustible gas in tanksB.blow out cargo lines to prevent the build up of gas concentrationsC.dilute tank atmospheres to keep gas concentrations below the lower explosive limitD.prevent fires in the pumproom by continually displacing flammable vapors

4.I used to _______ on electricity, but I’ve switched to gas.A、cookB、cookingC、cookedD、cooks

参考答案和解析
正确答案：C
气体面具过滤用于呼吸的空气中的污染物。
更多“Gas masks ______.A.should be worn while fighting a fireB.can be used in atmospheres defici ”相关问题

  • 第1题：

    Which method is used to supply inert gas from a flue gas system to the cargo tanks?

    A.Exhaust gas pressure from the stack

    B.High capacity fan

    C.Inert gas compressor

    D.Natural aspiration


    正确答案：B

  • 第2题：

    What is NOT a requirement for the safe and effective use of a crude oil washing system ________．

    A.Strip all tanks and remove the bottom residue

    B.Use an inert gas system while washing tanks

    C.Use portable washing machines to reach areas obscured by structural members in the tanks

    D.Debottom the tank used as the source for the tank cleaning machines


    正确答案：C

  • 第3题：

    Which statement is TRUE concerning buoyant work vests aboard tankers ________．

    A.They may be worn while working on deck but not while working over the side

    B.They must be used only under supervision of a designated ship's officer

    C.They will be accepted for up to 10% of the required life preservers

    D.They may be worn during drills


    正确答案：B

  • 第4题：

    Mail carriers are encouraged to ___comfortable shoes while on duty.

    A. wore
    B. wearing
    C. worn
    D. wear

    答案：D
    解析：
    encourage sb. to do sth 意为“鼓励某人做某事”，后接动词原形，因此选D。句意：邮差被鼓励在工作期间穿舒适的鞋子。

  • 第5题：

    For the IP address 192.168.2.1 which of the following subnet masks would be MOST likely used?（）

    • A、255.255.0.0
    • B、255.255.248.0
    • C、255.255.255.0
    • D、255.255.255.255

    正确答案:C

  • 第6题：

    单选题
    The fresh air intake of the inert gas system（）.
    A

    prevents the flue gas from falling below 3% content of oxygen

    B

    allows the inert gas piping to be used for gas freeing the tanks

    C

    opens when there is excessive vacuum on the deck water seal

    D

    enables outside air to mix with and cool hot flue gasses


    正确答案： D
    解析： 暂无解析

  • 第7题：

    单选题
    Gas masks（）.
    A

    should be worn while fighting a fire

    B

    can be used in atmospheres deficient in oxygen

    C

    filter contaminants from air that is to be breathed

    D

    may be substituted for a self-contained breathing apparatus


    正确答案： A
    解析： 暂无解析

  • 第8题：

    单选题
    Hot gas bypass is one of the methods used to （）
    A

    relieve excessive compressor head pressure

    B

    produce flash gas at the expansion valve

    C

    reduce flooding of the receiver at low load

    D

    defrost the evaporator coils


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    Which method is used to supply inert gas from a flue gas system to the cargo tanks?（）
    A

    Exhaust gas pressure from the stack

    B

    High capacity fan

    C

    Inert gas compressor

    D

    Natural aspiration


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    Each ship having an inert gas system must have a portable instruments to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure（）.
    A

    nitrogen

    B

    oxygen

    C

    carbon dioxide

    D

    water vapor


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    The component in an inert gas system used for cleaning the gas of solid and sulphur combustion products，while simultaneously cooling the inert gas，is called the（）.
    A

    filter

    B

    cooler

    C

    scrubber

    D

    purifier


    正确答案： B
    解析： 暂无解析

  • 第12题：

    单选题
    The preferred agent used in fighting a helicopter crash fire is（）.
    A

    CO2

    B

    dry chemical

    C

    water

    D

    foam


    正确答案： C
    解析： 暂无解析

  • 第13题：

    The fresh air intake of the inert gas system ______，

    A.Prevents the flue gas from falling below 3% content of oxygen

    B.Allows the inert gas piping to be used for gas freeing the tanks

    C.Opens when there is excessive vacuum on the deck water seal

    D.Enables outside air to mix with and cool hot flue gasses


    正确答案：B

  • 第14题：

    Which statement about inert gas pressures in a cargo tank is TRUE ________．

    A.The pressures of the inert gas in the tank may create excessive pressure at the pump while discharging

    B.Gas pressures should be maintained at the highest permissible level throughout the discharging process

    C.High gas pressures may cause pyrophoric oxidation in the tank

    D.High gas pressures may cause loss of suction when stripping


    正确答案：B

  • 第15题：

    Each ship having an inert gas system must have a portable instruments to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure ______.

    A.nitrogen

    B.oxygen

    C.carbon dioxide

    D.water vapor


    正确答案：B
    每一艘具有惰性气体系统的船舶必须有一个用于测量惰化空气中碳氢化合物气体和氧气浓度的便携式设备。

  • 第16题：

    What kind of （）can be used for gas and chemical fires?

    • A、equipment
    • B、apparatus
    • C、extinguishers
    • D、machines

    正确答案:C

  • 第17题：

    单选题
    Gas masks（）.
    A

    should be worn while fighting a fire

    B

    can be used in atmosphere deficient in oxygen

    C

    filter contaminants from air that is to be breathed

    D

    may be substituted for a self-contained breathing apparatus


    正确答案： D
    解析： 暂无解析

  • 第18题：

    单选题
    For the IP address 192.168.2.1 which of the following subnet masks would be MOST likely used?（）
    A

    255.255.0.0

    B

    255.255.248.0

    C

    255.255.255.0

    D

    255.255.255.255


    正确答案： A
    解析： 暂无解析

  • 第19题：

    单选题
    On all vessels equipped with refrigeration units of over 20 cubic foot capacity, （）.
    A

    a gas mask suitable for protection against each refrigerant used, or a self contained breathing apparatus must be provided

    B

    it is the sole responsibility of the chief engineer to ascertain that all members of the engineering department are familiar with the use of gas masks or breathing apparatus

    C

    spare charges shall be carried for at least 50% of each size and variety of gas masks and/or self contained breathing apparatus

    D

    all of the above


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    The Romans used to sell _____ by auction.
    A

    spoilt goods

    B

    old-worn weapons

    C

    property taken from the enemy

    D

    spears


    正确答案： C
    解析：
    考察词义。文章第二段第二句：The Romans usually sold in this way the spoils taken in war，这里的spoils taken in the war，指的就是从战争中缴获的战利品。答案为C。

  • 第21题：

    单选题
    Gas turbines differ from steam turbines in that （）.
    A

    steam rather than gas is used to turn a shaft

    B

    vapor rather than gas is used to turn a shaft

    C

    the former uses gas to turn a shaft

    D

    the latter uses gas to turn a shaft


    正确答案： D
    解析： 暂无解析

  • 第22题：

    单选题
    An inert gas system on a tanker should be used to（）.
    A

    prevent the generation of flammable or combustible gas in tanks

    B

    blow out cargo lines to prevent the build up of gas concentrations

    C

    dilute tank atmospheres to keep gas concentrations below the lower explosive limit

    D

    prevent fires in the pumproom by continually displacing flammable vapors


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    An inert gas system on a tanker should be used to（）.
    A

    prevent the generation of flammable or combustible gas in tanks

    B

    blow out cargo lines to prevent gas concentrations

    C

    dilute tank atmospheres to keep gas concentrations below the lower explosive limit

    D

    prevent fires in the pumproom by continually displacing flammable vapors


    正确答案： D
    解析： 暂无解析

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