n. countersink
misc. counter bore
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这些可能是切片薄刨花，沉孔，扩孔，或其他操作。
These may be slicing off thin shavings, countersinking, counterboring, or other operations.
螺钉固定孔、螺钉调节孔为锥形沉孔。
The screw fixing hole and the screw adjusting holes are tapered counter bores.
预紧工况下，缸盖螺栓沉孔深度对气缸套变形影响很大，适当的缸盖螺栓沉孔深度有利于减小气缸套变形。
Preload condition, the cylinder head bolt-hole depth of deformation of the cylinder sets a great impact on the proper cylinder head bolt hole depth Shen cylinder l.
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