Report - 초음파 치석제거기 (Ultrasonic scaler)elearning.kocw.net/KOCW/document/2016/shinhan/yoonmisook/... · 2017-02-20 · 초음파란? 사람이들을수있는소리인가청주파수(16~20,000Hz)를넘는진동수2만

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