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

对设而言,指无马达和用手操作设(工键穿孔机、工打字机)。

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

简地介绍了三辊穿孔机所穿质量及该穿孔机特有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.

穿孔机是轧制钢重设,而机架又是穿孔机核心组成部分。