穿孔机

Of equipment; without a motor and intended for hand operation (“a manual keypunch”; “a manual typewriter”).

而言,指无马达和用手操作的(如人工键穿孔机、人工打字机)。

The briefing covers quality of the shell pierced by the three-high piercing mill, thespecific rolling failures and countermeasures thereagainst.

简要地介绍了三辊穿孔机所穿毛管的质及该穿孔机特有的轧制故障和预防措施。

Piercing mill is the most important equipment on the rolling pipe line,and the frame is the nucleal component of the piercing mill.

穿孔机是轧制钢管的重要,而机架又是穿孔机的核心组成。