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f number

n.
1.the ratio of the focal length to the diameter of a (camera) lens system

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    Idiom of the Day

    on a waiting list
    on a list of people waiting for something
    My father is on a waiting list to get an operation on his knee.



    1.
    Cathy was the ________ survivor of the plane crash.

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    Scientific Instruments & Appliances
    Scientific Instruments & Appliances
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    is a mechanical integrating instrument to measure area of a plane surface.      .. More >>
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