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High concentrations of H2S gas are most dangerous to personnel because they can ______.A.cause involuntary muscle contractionsB.paralyze your breathing systemC.cause eye inflammationD.cause dizziness

题目

High concentrations of H2S gas are most dangerous to personnel because they can ______.

A.cause involuntary muscle contractions

B.paralyze your breathing system

C.cause eye inflammation

D.cause dizziness

相似考题

1.Why do the depository institutions have the fractional reserve banking?A．Because they can keep a large amount of deposits from their depositors in the form. of reserves.B．Because most of their depositors would withdraw their deposits.C．Because only a small fraction of their depositors would deposit money during a day or week.D．Because they can meet the need of withdrawing of their depositors and make investments in other financial assets.

2.This passage implies that ______.A) buying a false degree is not moralB) personnel officers only consider applicants from famous schoolsC) most people lie on applications because they were dismissed from schoolD) society should be greatly responsible for lying on applications

3.By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine The device most commonly used is aA.tachometerB.pyrometerC.dynamometerD.calorimeter

4.From the gas stations and convenience stores, most middle school and high school smokers get their tobacco.()此题为判断题(对，错)。

更多“High concentrations of H2S gas are most dangerous to personnel because they can ______.A.c ”相关问题

  • 第1题：

    One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is

    A.the 'snow' which is sometimes discharged along with the gas is toxic

    B.prolonged exposure to high concentrations of CO2 gas causes suffocation

    C.rapid dissipation of the CO2 vapor

    D.the CO2 gas is lighter than air and a large amount is required to extinguish a fire near the deck


    正确答案：B

  • 第2题：

    The safe operations of a liquified gas can be found in ________ ．

    A.International Maritime Dangerous Goods Carried by Sea

    B.International Code for the Construction and Equipment of Ships Carrying Gases in Bulk

    C.International Convention for the Safety of Life at Sea

    D.International Regulations for Preventing Collisions at Sea


    正确答案：B

  • 第3题：

    Individuals who have consumed alcohol within 24 hours of exposure to H2S can tolerate ______.

    A.unusually large concentrations of H2S

    B.smaller than normal concentrations of H2S

    C.moderate concentrations of H2S without the usual reactions

    D.longer exposure to H2S concentrations


    正确答案：B

  • 第4题：

    A large oil fire on the deck of a ship can be fought most effectively with ______.

    A.dry chemical

    B.foam

    C.high-velocity fog

    D.water (cartridge-operated)、


    正确答案：B
    甲板上大量由油水引起的火灾最有效的扑救方法是泡沫。

  • 第5题：

    单选题
    Most troubles likely to occur with marine diesel engine can, if located in time, be remedied with no difficulty and many can be （）if the engine is maintained with a high sense of responsibility to the people on the part of the motormen and engineers.
    A

    found out

    B

    eliminated

    C

    avoided

    D

    lowered


    正确答案： C
    解析： 暂无解析

  • 第6题：

    问答题
    Most people would describe water like a colorless liquid. They　　　　　　　　 (1) _______would know that in very cold conditions it becomes a solid calledice and that when heating on a fire it becomes a vapor called steam.　　　　　　　(2) _______However, water, they would say, is a liquid. We have learned thatwater consists of molecules composed with two atoms of hydrogen　　　 　　　　　　(3) _______and one atom of oxygen, which we describe by the formula H2O.This is equally true of the solid called ice and the gas called steam.Chemically there is no difference between the gas, the liquid, andthe solid, all of which is made up of molecules with the formula H2O.　 　　　　　(4) _______This is true of other chemical substances; most of them can exist asgases or as liquids or as solids. We may normally think of iron as asolid, but if we will heat it in a furnace, it will melt and become a　 　　　　　(5) _______liquid, and at very high temperatures it will become a gas. Nothingvery permanent occurs when a gas changes into a liquid or a solid.Everyone knows that ice, which has been made by freezing water,can be melted again by warmed and that steam can be condensed　　　 　　　　　　　(6) _______on a cold surface to become liquid water. In fact, it is only becausewater is so a familiar substance that different names are used for　　　　　　　　(7) _______the solid, liquid and gas. Most substances are only familiar with　　　　　　　　 (8) _______us in one state, because the temperatures requiring to turn them　　　　　　　　　(9) _______into gases are very high, or the temperatures necessary to turn theminto solids are so low. Water is an exception in this respect, whichis another reason why its three states have given three different　　　　　　　　(10) _______names.

    正确答案：
    1.like改为as describe sth. as sth.“将……描述成……”,是固定说法。
    2.heating改为heated 此处为时间状语从句,从句和主句主语一致,从句主语和be的变化形式可以省略。
    3.with改为of     be composed of是固定搭配,意为“包括,由……组成”。
    4.is改为are     which指代the gas, the liquid, and the solid,表示复数概念,应该用are。
    5.去掉第一个will 在时间条件状语从句和条件状语从句中用现在时表示将来。
    6.by改为when     when warmed等于when it is warmed,it is可以省略。
    7.so改为such     so+ adj.+ a(n)+n.和such a(n)+adj.+ n.是固定说法,没有so+ a(n)+ adj. +n.这种说法。
    8.with改为to     A be familiar to B指“B熟悉A”;A be familiar with B 指“A熟悉B”。
    9.requiring改为required     temperatures和require是逻辑动宾关系。
    10.have后加been 动词give和主语three states是动宾关系,所以这里要使用被动语态。
    解析： 暂无解析

  • 第7题：

    单选题
    Since accumulations of H2S gas on a ship can be dangerous to personnel，it is important to know that H2S gas is（）.
    A

    lighter than air

    B

    heavier than air

    C

    a yellow gas that is easily recognized

    D

    mildly toxic


    正确答案： A
    解析： 暂无解析

  • 第8题：

    单选题
    Nylon line can be dangerous because it（）.
    A

    breaks down when wet

    B

    kinks be discharged

    C

    is not elastic

    D

    stretches


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    It is likely that the authors of Passages 1 and 2 would agree that ______.
    A

    chimps should be valued because of their genetic closeness to humans

    B

    increasing legislation would effectively protect the chimpanzees

    C

    humanity is a major factor in the decimation of chimps

    D

    chimps can be dangerous and unpredictable and should be treated with caution

    E

    only through heroic and unprecedented measures can the chimp be saved


    正确答案： B
    解析：
    两篇文章都提到了人类是以何种方式危害黑猩猩的生存，故选C项。

  • 第10题：

    单选题
    It can be inferred that the author of the text most likely regards the criticism of methanol as ______.
    A

    flawed because of the assumptions on which it is based

    B

    inapplicable because of an inconsistency in the critics’ arguments

    C

    misguided because of its exclusively technological focus

    D

    inaccurate because it ignores consumers’ concerns


    正确答案： B
    解析：
    细节推导题。文章第四段首句指出“Like any alternative fuel, methanol has its critics”，可知接下来要讲的就是methanol“甲醇”的不足之处，第二句提到“Yet much of the criticism is based on the use of “gasoline clone” vehicles that do not incorporate even the simplest design improvements that are made possible with the use of methanol.”即作者认为人们觉得甲醇有问题是因为所基于的假设，A项正确。

  • 第11题：

    单选题
    “In times of heavy weather, it is extremely dangerous if manning is very short” This sentence means （）.
    A

    In times of heavy weather, it is extremely dangerous if a seaman is not enough tall

    B

    In times of heavy weather, it is extremely dangerous if a crew is very short

    C

    In case of bad weather, it is particularly dangerous if there is a shortage in personnel

    D

    In case of bad weather, it is particularly dangerous if there are enough personnel


    正确答案： C
    解析： 暂无解析

  • 第12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

  • 第13题：

    Keep compartment ______ as the gas given off can be dangerous.

    A.in good order

    B.well clean

    C.well ventilated

    D.more room


    正确答案：C

  • 第14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

  • 第15题：

    When H2S is burned（flared）on a ship，what can you expect to occur ________．

    A.All of the H2S will be converted to SO2

    B.All of the H2S will be converted to hydrogen and free sulfur

    C.Only 80% of the H2S will be converted to SO2 or free sulfur

    D.The H2S not converted will not be dangerous


    正确答案：C

  • 第16题：

    If you are in the dangerous semicircle of a hurricane you can expect all of the following except ______.

    A.backing winds

    B.high seas

    C.high winds

    D.veering winds


    正确答案：A
    如果你在飓风的危险半圆里，下列除了逆转风其它都可以遇到。

  • 第17题：

    单选题
    One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is （）.
    A

    the snow which is sometimes discharged along with the gas is toxic

    B

    prolonged exposure to high concentrations of  C02 gas causes suffocation

    C

    rapid dissipation of the C02 vapor

    D

    the C02 gas is lighter than air and a large amount is required to extinguisha fire near the deck


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    Keep compartment （） as the gas given off can be dangerous.
    A

    well ventilated

    B

    well clean

    C

    in good order

    D

    more room


    正确答案： A
    解析： 暂无解析

  • 第19题：

    判断题
    It is dangerous for people to live on the Earth if CO2 concentrations continue to rise.
    A

    对

    B

    错


    正确答案： 对
    解析：
    该段录音中指出“最近趋势显示二氧化碳的排放量正在超过大自然的吸收能力”，过去几年空气中二氧化碳含量的增速突然上升到2.54 ppm或以上，这意味着自然系统减少碳排放量的能力正在减弱。可推测，如果二氧化碳浓度持续升高，居住在地球上将会是危险的。
    【录音原文】
    Recent trends suggest that carbon emissions are outpacing absorption. Over the past two decades, atmospheric C02 concentrations rose each year, on average, by 1.5 parts per million (ppm), but the last few years have seen unexplained and alarming jumps of up to 2.54 ppm and beyond. This suggests that the ability of the Earth’s natural systems to mitigate the rise in carbon emissions is weakening.

  • 第20题：

    单选题
    By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）
    A

    tachometer

    B

    pyrometer

    C

    dynamometer

    D

    calorimeter


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    It could be dangerous because the leaking gas might easily penetrate the building.
    A

    overlap

    B

    retreat from

    C

    spread through

    D

    reach


    正确答案： C
    解析：
    句意：泄露的油可能会渗透到整个大楼，这很危险。penetrate渗透。spread through蔓延开来。overlap重叠。retreat from退出；放弃。reach到达。

  • 第22题：

    单选题
    By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engineThe device most commonly used is a（）.
    A

    tachometer

    B

    pyrometer

    C

    dynamometer

    D

    calorimeter


    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 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

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