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锪孔
詞典解釋：◎锪孔huōkǒng(1)[countersinking]∶在孔的頂部周圍作成漏斗形凹坑的鉆進(jìn)操作(2)[spot-facing]∶在孔的頂部周圍作成圓柱形凹坑以便安置螺釘頭或墊圈,或者使連接零件能齊平安裝
