Cloud formations are minimal when the ______.A.surface temperature and temperature aloft are equalB.surface temperature and temperature aloft differ greatlyC.barometric pressure is very lowD.relative humidity is very high

题目

Cloud formations are minimal when the ______.

A.surface temperature and temperature aloft are equal

B.surface temperature and temperature aloft differ greatly

C.barometric pressure is very low

D.relative humidity is very high

相似考题

1.Scarcely _____ above 35℃ in summer in this city.A. the temperature goesB. does the temperature goC. the temperature wentD. did the temperature go

2.The dew point is reached when the ______.A.temperature of the air equals the temperature of the seawaterB.atmospheric pressure is 14.7 lbs. per square inchC.relative humidity reaches 50%D.air becomes saturated with water vapor

3.Sweat damage in a hatch full of canned goods in cartons will occur when the ______．A.Air temperature is higher than the temperature of the cargoB.Air temperature is lower than the temperature of the cargoC.Dew point is higher than the temperature of the cargoD.Dew point is lower than the temperature of the cargo

4.Sweat damage will occur in a cargo hold containing machinery parts when ______.A.the outside air is colder than the cargo．B.the air temperature of the hold is higher than the outside air temperature．C.the dew point of the hold is higher than the temperature of the cargo．D.the dew point of the outside air is lower than the temperature of the cargo

参考答案和解析
正确答案：A
水面及其上方的温度相同时云的形成最小。
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  • 第1题：

    Which statement is TRUE concerning the flash point of a substance ________．

    A.It is lower than the ignition temperature

    B.It is the temperature at which a substance will spontaneously ignite

    C.It is the temperature at which a substance，when ignited，will continue to burn

    D.It is the temperature at which the released vapors will fall within the explosive range


    正确答案：A

  • 第2题：

    在UPS电源中，“逆变器散热片的温升过高自动关机”的专业英语为（）。

    • A、High-temperature shutdown
    • B、Over-temperature shutdown
    • C、Up-temperature shutdown
    • D、Under-temperature shutdown

    正确答案:B

  • 第3题：

    单选题
    Early injection timing is indicated by （）.
    A

    high exhaust temperature and low firing pressure

    B

    high exhaust temperature and high firing pressure

    C

    low exhaust temperature and low firing pressure

    D

    low exhaust temperature and high firing pressure


    正确答案： C
    解析： 暂无解析

  • 第4题：

    单选题
    The humidifier’s valve of air-condition should be （）, when the temperature is lower than 0℃.
    A

    decreased

    B

    increased

    C

    fixed

    D

    closed


    正确答案： B
    解析： 暂无解析

  • 第5题：

    单选题
    How are the pressure and temperature affected in a diesel engine cylinder during compression?（）
    A

    Pressure and temperature decrease

    B

    Pressure and temperature increase

    C

    Pressure decreases and temperature increases

    D

    Pressure increases and temperature decreases


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    When preparing an engine for water temperature（）
    A

    should be kept at a proper level by a cooler

    B

    should be raised to about 80℃ by a heater

    C

    should be raised gradually

    D

    should be lowered to about 60℃


    正确答案： A
    解析： 暂无解析

  • 第7题：

    单选题
    Which of the following statements is correct concerning the “flash point ” of a liquid?（）
    A

    It is lower than the ignition temperature

    B

    It is the temperature at which a substance will spontaneously ignite

    C

    It is the temperature at which a substance, when ignited, will continue to bum

    D

    It is the temperature at which the released vapors will fall within the explosive range


    正确答案： A
    解析： 暂无解析

  • 第8题：

    单选题
    When bilge water is heated in a holding tank, which one of the following statements is not accurate?（）
    A

    The high temperature facilitates primary gravity separation

    B

    Most of the oil and organic solvents are raised to the top layer

    C

    The high the temperature is, the more the top oil will be collected

    D

    The high temperature has little use on the separation of emulsified oil


    正确答案： D
    解析： 暂无解析

  • 第9题：

    单选题
    Reheating a hardening component to a temperature lower than the hardening temperature and then cooling it is known as （）
    A

    low temperature hardening

    B

    case hardening

    C

    annealing

    D

    tempering


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    Cloud formations are minimal when the（）.
    A

    surface temperature and temperature aloft are equal

    B

    surface temperature and temperature aloft differ greatly

    C

    barometric pressure is very low

    D

    relative humidity is very high


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    When fuel is injected in a diesel engine cylinder too early, （）
    A

    ignition may be delayed

    B

    fuel economy is not affected

    C

    exhaust gas temperature will be unchanged

    D

    the exhaust will be clear


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    A space should be ventilated when（）.
    A

    The cargo's temperature is colder than the dew point of the air in the space

    B

    The cargo's temperature is warmer than the dew point of the air in the space

    C

    The dew point of the air in the space is lower than the dew point of the outside air

    D

    All of the above


    正确答案： A
    解析： 暂无解析

  • 第13题：

    The moisture equilibrium chart can be used to determine the ______．

    A.Absolute moisture content of the air surrounding a hygroscopic cargo when moisture equilibrium exists

    B.Dew point temperature that the air surrounding a hygroscopic commodity will have when in moisture equilibrium with that commodity

    C.Enthalpy of the air surrounding a hydroscopic cargo which is in moisture equilibrium with the cargo

    D.Temperature at which moisture equilibrium will occur in a cargo hold containing a hygroscopic cargo


    正确答案：B

  • 第14题：

    单选题
    When the temperature of the refrigerant flowing out from the condenser is below the condensing temperature, it is said to be （）.
    A

    dry

    B

    wet

    C

    super-cooled

    D

    superheated


    正确答案： C
    解析： 暂无解析

  • 第15题：

    单选题
    Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a （）.
    A

    high temperature and a high viscosity

    B

    high temperature and a low viscosity

    C

    low temperature and a high viscosity

    D

    low temperature and a low viscosity


    正确答案： A
    解析： 暂无解析

  • 第16题：

    单选题
    The dew point of air is reached when the wet bulb temperature is （）.
    A

    Twice the dry bulb temperature

    B

    10℃ above the dry bulb temperature

    C

    5℃ above the dry bulb temperature

    D

    Equal to the dry bulb temperature


    正确答案： C
    解析： 暂无解析

  • 第17题：

    单选题
    In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, it is said to be （）.
    A

    superheated

    B

    saturated

    C

    condensed

    D

    convected


    正确答案： B
    解析： 暂无解析

  • 第18题：

    单选题
    In terms of pressure and temperature in the refrigerant in the compressor, what happens to the primary?（）
    A

    its pressure and temperature are both lowered

    B

    its pressure and temperature are both raised

    C

    its pressure is lowered and its temperature is raised

    D

    its pressure is raised and its temperature is lowered


    正确答案： B
    解析： 暂无解析

  • 第19题：

    单选题
    A cargo hold has been determined to have a relative humidity of 80% and a dry bulb temperature of 80 ℃ and a dry bulb temperature of 85℃.When the hold is sealed and the dry bulb temperature decreases, the relative humidity in the space will （）
    A

    decrease

    B

    increase

    C

    decrease to zero

    D

    remain unchanged


    正确答案： B
    解析： 暂无解析

  • 第20题：

    单选题
    Ambient temperature is the （）.
    A

    amount of temperature rise with no load

    B

    temperature of the compartment where the motor is located

    C

    normal operating temperature, less the room temperature

    D

    amount of temperature developed by an operating motor


    正确答案： D
    解析： 暂无解析

  • 第21题：

    单选题
    Which of the following statements is correct concerning the viscosity of lubricating oil?（）
    A

    Viscosity will increase as temperature increases

    B

    Viscosity is a measure of a fluid s internal resistance to flow

    C

    Viscosity will decrease as temperature decreases

    D

    Viscosity is not dependent on temperature


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    Concerning the incinerator’s operation, which of the following is not correct?（）
    A

    Scavenging time should be more 30 seconds before igniting

    B

    The temperature of sludge tank is 80~100℃

    C

    First igniting the incinerator with diesel oil, when the temperature of health is about 600℃, the sludge oil drawn in

    D

    The ash can be dumped into sea when the distance is more than 3 miles from land


    正确答案： B
    解析： 暂无解析

  • 第23题：

    单选题
    After a cold front passes，the barometric pressure（）.
    A

    drops，and the temperature drops

    B

    drops，and the temperature rises

    C

    rises，and the temperature drops

    D

    rises，and the temperature rises


    正确答案： C
    解析： 暂无解析

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