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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. 齒根下即齒區以下的外逕爲15毫米；在超聲波發射程距的缺陷処，3毫米的平底孔沒有顯示出來。 www.jxcad.com.cn