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pyrophosphoric acid

n.
1.a solid acid formed by reactions of orthophosphoric acid

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    Idiom of the Day

    days running
    several days in a row
    There were concerts at the auditorium for six days running.



    1.
    Because of the emergency help (a) / that the patient received, (b) / he would have died. (c) / No error (d)

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