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thermionic valve

n.
1.electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

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    Idiom of the Day

    wreak havoc on/with (something)
    to cause a lot of trouble or damage to something
    The hurricane wreaked havoc on the small town.



    1.
    One morning there was quite a hubbub (loud noise and activity) in the Fortune ________ when Cathy came rushing into the sitting room helter skelter (running at great speed),

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    My Account / Test History
    Unit
    Unit : gallon (gal)
    Formula : 231*cubic_inch
    in si : 0.0037854
    si unit : m3
    in cgs : 3785.4
    cgs unit : cm3
    Category : volume.      .. More >>
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