long period stacking structure
81Auditory brainstem response — The auditory brainstem response (ABR) is an auditory evoked potential extracted from ongoing electrical activity in the brain and recorded via electrodes placed on the scalp. The resulting recording is a series of vertex positive waves of which I …
82History of Boston — 1740 Faneuil Hall, sketch by John Smybert The 18th century Old State House in Bosto …
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