|
| |
| | |
| <![CDATA[<object id="osjwg"><tt id="osjwg"></tt></object>]]><![CDATA[<dfn id="osjwg"><samp id="osjwg"></samp></dfn>]]> |
|---|
| |
<![CDATA[<dfn id="osjwg"><cite id="osjwg"></cite></dfn>]]>
|
| |
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
