A tank has been sealed and unventilated(不通风的) for a long period of time. Which of the following conditions does this indicate?A.The tank is safe to enterB.The tank is especially dangerous to enterC.Carbon monoxide(一氧化物) is presentD.Water vapor present whe

题目

A tank has been sealed and unventilated(不通风的) for a long period of time. Which of the following conditions does this indicate?

A.The tank is safe to enter

B.The tank is especially dangerous to enter

C.Carbon monoxide(一氧化物) is present

D.Water vapor present when the tank was sealed has oxidized(使氧化)

相似考题

1.It has been a long time _____I saw you last time.A.sinceB.forC.beforeD.after

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3.－Hello, David! I haven’t heard from you for a long time. How have you been recently －()A、Not bad, thank you.B、That’s ok.C、Long time no see.

4.Don't worry, your watch () and you can have it in no time.A、is repairedB、has been repairedC、is being repaired

更多“A tank has been sealed and unventilated(不通风的) for a long period of time. Which of the ”相关问题

  • 第1题：

    He has lived ( ) some foreign students for a long time.

    A、with

    B、in

    C、among

    D、about


    参考答案：C

  • 第2题：

    Hello, David! I haven't heard from you for a long time. How have you been recently?()

    A. That's ok

    B. Long time no see

    C. Not bad, thank you


    参考答案：C

  • 第3题：

    Our modern civilization must not be thought of as ________ in a short period of time.

    [A] being created

    [B] to have been created

    [C] having been created

    [D] to be created


    正确答案：C

  • 第4题：

    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 gases

    B.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 content

    D.The heat of the sun on upper ballast tanks，such as in a bulk carrier，may generate carbon monoxide


    正确答案：A

  • 第5题：

    A:Hello, David! I haven't heard from you for a long time. How have you been recently? B:（）

    • A、That's ok
    • B、Long time no see
    • C、Not bad, thank you

    正确答案:C

  • 第6题：

    单选题
    Purging air from a hydraulic system is necessary when（）
    A

    adding small amounts of oil to the system

    B

    the system has been overheated

    C

    the system has been drained and then filled with new oil

    D

    the system has been idle for a long period of time


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    After being launched from a vessel，totally enclosed survival craft which have been afloat over a long period require（）.
    A

    frequent opening of hatches to permit entry of fresh air

    B

    regular checks of bilge levels

    C

    use of ear plugs to dampen engine noise

    D

    frequent flushing of the water spray system with fresh water


    正确答案： B
    解析： 暂无解析

  • 第8题：

    单选题
    View the Exhibit to examine the metrics with a threshold.Which statement is true regarding the Number of Transactions (per second) metric?（）
    A

    Oracle uses statistical relevance to determine when an adaptive threshold has been breached for the metric.

    B

    The statistics for the metric values observed over the baseline time period are not examined to determine threshold values.

    C

    Oracle determines when an adaptive threshold has been breached based on the maximum value captured by the baseline.

    D

    The total concurrent number of threshold violations, which must occur before an alert is raised for the metric, has been set to zero.


    正确答案： D
    解析： 暂无解析

  • 第9题：

    单选题
    A ship crane which has been idle for a period of over six months shall be inspected to the same standards as a（）.
    A

    yearly inspection

    B

    quarterly inspection

    C

    monthly inspection

    D

    weekly inspection


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    A tank has been sealed and unventilated for a long period of timeWhich of the following conditions does this indicate?（）
    A

    The tank is safe to enter

    B

    The tank is especially dangerous to enter

    C

    Carbon monoxide is present

    D

    Water vapor present when the tank was sealed has oxidized


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    You are on a containership carrying a tank container that had been filled with sodium hydroxide solution. The container is empty but has not been cleaned. Which，if any，placard is required?（）.
    A

    No placard is required; the tank openings must be sealed

    B

    Empty placard with corrosive placard

    C

    Residue label with the UN number

    D

    Black and white corrosive placard


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    Initially， for the Automatic Workload Repository （AWR） statistics，the retention period is set to 7 days， the collection interval is set to 30 minutes and the collection level is set to Typical in your production database. You have been using the Memory Advisor for the last three months to generate recommendations for tuning memory components. However，when you observe the Memory Advisor on a Friday，you find that the statistics are available only for two days， Thursday and Friday，of that week. What would have caused the statistics to be removed？（）
    A

    On Wednesday， the statistics have been purged.

    B

    On Wednesday， the retention period has been set to zero.

    C

    On Wednesday， the collection interval has been set to zero.

    D

    On Wednesday， the collection level has been changed to All.

    E

    On Wednesday， the retention period has been set to one day.

    F

    On Wednesday， the retention period has been set to two days

    G

    On Wednesday, the collection level has been changed to Typical.

    H

    On Wednesday, the collection interval has been set to 1440 minutes.


    正确答案： F
    解析： 暂无解析

  • 第13题：

    —I saw Dave in lift this morning.— Really? He ______ around here for a long time.

    A won’t be seen

    B wasn’t see

    C hasn’t been seen

    D hadn’t been seen


    参考答案：D

  • 第14题：

    Nobody but Jack and Jane () made great progress in the history examination this time.

    A、have

    B、has

    C、had

    D、has been


    参考答案：B

  • 第15题：

    A ship crane which has been idle for a period of over six months shall be inspected to the same standards as a ______.

    A.yearly inspection

    B.quarterly inspection

    C.monthly inspection

    D.weekly inspection


    正确答案：A

  • 第16题：

    Which statement about entering into a tank which has been sealed for a long time is TRUE ________．

    A.The tank should be tested only once to ensure the oxygen content is at least 14% before entry

    B.The tank must be tested at frequent intervals to ensure that hazardous gasses have not regenerated

    C.The tank need not be tested for oxygen content if it is ventilated for more than 24 hours

    D.If the oxygen content tests at less than 12% you should wear an approved gas mask


    正确答案：B

  • 第17题：

    Initially， for the Automatic Workload Repository （AWR） statistics，the retention period is set to 7 days， the collection interval is set to 30 minutes and the collection level is set to Typical in your production database. You have been using the Memory Advisor for the last three months to generate recommendations for tuning memory components. However，when you observe the Memory Advisor on a Friday，you find that the statistics are available only for two days， Thursday and Friday，of that week. What would have caused the statistics to be removed？（）

    • A、On Wednesday， the statistics have been purged.
    • B、On Wednesday， the retention period has been set to zero.
    • C、On Wednesday， the collection interval has been set to zero.
    • D、On Wednesday， the collection level has been changed to All.
    • E、On Wednesday， the retention period has been set to one day.
    • F、On Wednesday， the retention period has been set to two days
    • G、On Wednesday, the collection level has been changed to Typical.
    • H、On Wednesday, the collection interval has been set to 1440 minutes.

    正确答案:F

  • 第18题：

    单选题
    If there has been a fire in a closed unventilated compartment it may be unsafe to enter because of （）.
    A

    unburned carbon particles

    B

    excess nitrogen

    C

    a lack of oxygen

    D

    excess hydrogen


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    Malware has been detected and removed on a customer computer several times in a short periodof time. Which of the following will BEST help prevent future occurrences?（）
    A

    Defragment the hard drive

    B

    Discuss safe web-browsing habits with the customer

    C

    Delete temporary files, cookies and browser history

    D

    Install anti-virus software which uses manual updates


    正确答案： B
    解析： 暂无解析

  • 第20题：

    单选题
    A tank which has been sealed for a long period of time can be dangerous because （）.
    A

    steel surfaces consume oxygen by rusting

    B

    sealed tanks usually form a vacuum

    C

    moisture condenses in the tank, displacing the oxygen

    D

    most tank coatings give off poisonous vapors in the presence of moisture


    正确答案： D
    解析： 暂无解析

  • 第21题：

    单选题
    我们的重吊杆已经长时间不用了。（）
    A

    Our derrick has been out of use for a long time.

    B

    Our heavy derrick has been out of use for a long time.

    C

    Our crane has been out of use for a long time.

    D

    Our winch has been out of use for a long time.


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    Following a grounding, you can best determine that a SLACK fuel oil tank has been holed by （）.
    A

    sounding the tank

    B

    waiting for the vessel to list

    C

    examining tank boundaries

    D

    checking fuel oil strainers


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    The Hallside site has been ______.
    A

    turned into a steelworks from a woodland and an energy park.

    B

    in use as an energy park .

    C

    disused for a long period of time .

    D

    out of use for a short period of time .


    正确答案： C
    解析：
    根据题干关键词Hallside site可定位到原文C和D段，C段中“Hallside’s closure in 1979 put an end to more than 100 years of steel production”，可知该厂与1979年倒闭，D段中“The site’s 30 hectares were left abandoned until 1990”，可知直到1990年该厂才开始重新使用。因此，可以得知从1979年到1990年该厂一致出于废弃状态，因此，C项的长期不被使用与该意相符，为正确选项。

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