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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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