bow pen,pen bow是什么意思

用法例句

There are two ways to remove small round bars' rolling edges: a portable grinder for those with a diameter equal to or greater than 16 mm and a centreless grinding machine for those with a diameter smaller than 16 mm.

小圆钢表面耳子缺陷有两种解决方法:≥16 mm时,用手提砂轮机磨去耳子;<16 mm时,用砂轮无芯磨床研磨去除耳子。

Based on geometry analysis and the practical cases, a simple method for sketching of small well is worked out.

从几何分析出发，结合实例介绍了制作小圆井素描展开图的简单方法，其精度可达地质要