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OD to 15 mm below tooth root , ie tooth zone . No indication exceeding that equal to 3 mm flat bottom hole at the defect beam path distance. 齿根下即齿区以下的外径为15毫米；在超声波发射程距的缺陷处，3毫米的平底孔没有显示出来。 www.jxcad.com.cn