Maybe use this as a special drill with less people.
这个练习可能对很少的人有用。
The special drill press for the stand pillar is introduced.
介绍了一种高速公路护栏立柱专用钻床。
The special drilling machine whose principle and construction were introduced was used to drill holes.
本文简要介绍了一种钻削马鞍床身安装孔装置的设计原理、主要结构等。
The special drilling machine whose principle and construction were introduced was used to drill holes.
本文简要介绍了一种钻削马鞍床身安装孔装置的设计原理、主要结构等。
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