- super hole cutter
- 开: open; turn on; switch on; be ...
- 孔钻: dowelling jig
- 开孔钻头: collaring bit; opening bit; short borer
- 套管制成的开孔钻头: starting casing barrel
- 开孔: cutout; open pore; open-cell; perforate; perforation; piercing; port; scallop; sluice opening; start a hole; starting a hole; tapping; trepan
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