钻孔单元具有空行程快进，慢速工进和快速回程功能，提高工作效率。
Drilling unit has the functions including rapid falling, slow work-feeding and quick feeding back to improve working efficiency.
钻孔单元具有空行程快进，慢速工进和快速回程功能，提高工作效率。
Drilling unit has the functions including rapid falling, slow work-feeding and quick feeding back to improve working efficiency.
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