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counter bore
auto. 扩口; 沉头孔
avia. 钻埋头孔
dentist. 埋头钻孔
eng.geol. 平底扩孔钻; 钻平底孔; 擴孔鑽
oil 埋头孔; 锥口孔
telecom. 沉孔

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