常见例句双语例句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 返回 beam path distance