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航海英语航海气象基本知识单项选择题每日一练(2018.12.17)

  • 单项选择题

    A boundary between two air masses is a(n)().

    A.lapse rate
    B.isobar
    C.front
    D.continent

  • 单项选择题

    A series of brief showers accompanied by strong,shifting winds may occur along or some distance ahead of a(n)().

    A.upper front aloft
    B.cyclone
    C.occluded front
    D.cold front

  • 单项选择题

    Clouds are classified according to their().

    A.size
    B.moisture content
    C.altitude and how they were formed
    D.location in a front

  • 单项选择题

    Cyclones tend to move().

    A.perpendicular to the isobars in their warm sectors
    B.parallel to the isobars in their warm sectors
    C.parallel to the line of the cold front
    D.perpendicular to the line of the cold front

  • 单项选择题

    ()causing strong winds and rough sea north west Bay of Biscay.

    A.Strong low pressure
    B.Strong high pressure
    C.Steep pressure gradient
    D.Steep gradient pressure

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