空心钻 core drill
[机] hollow drill
- 在图12.2中同样能看到,空心钻具有平坦的端部。
It can also be seen in Fig. 12.2 that a core drill has flat end. - 经营产品为: 磁力钻, 攻丝机, 空心钻头及钢轨钻头。
Our products include: magnetic drill, threading machine, hollow bit and rail drill. - 立管内部核心是空心的(管中管),留给钻柱使用。
The riser’s inner hollow core (a pipe within a pipe) is reserved for the drill string.