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航海英语海洋学基本知识单项选择题每日一练(2018.12.04)

  • 单项选择题

    In most cases,the direction of the apparent wind lies between the bow and().

    A.the direction of the true wind
    B.true north
    C.the beam on the windward side
    D.the beam on the lee side

  • 单项选择题

    Ocean currents are well defined and().

    A.create large waves in the direction of the current
    B.change direction 360°during a 24 hour period
    C.remain fairly constant in direction and velocity throughout the year
    D.are characterized by a light green color

  • 单项选择题

    In some river mouths and estuaries the incoming high-tide wave crest overtakes the preceding low-tide trough. This results in a wall of water proceeding upstream,and is called a().

    A.seiche
    B.bore
    C.boundary wave
    D.surge

  • 单项选择题

    A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles is approximately().

    A.3 hours
    B.6 1/2 hours
    C.12 1/2 hours
    D.25 hours

  • 单项选择题

    A backlash below a lock is defined as().

    A.a current setting your vessel on the wall
    B.a current setting into the lock chamber
    C.an eddy working along the lower guide wall
    D.a current setting counterclockwise

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