beam path distance
常見例句
- 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.
齒根下即齒區(qū)以下的外逕爲(wèi)15毫米；在超聲波發(fā)射程距的缺陷処，3毫米的平底孔沒有顯示出來。
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