bottom punch是什么意思

用法例句

A film down rushing law in intermittent film transport is studied theoryetically and experiment ally.

本文从理论和实验两方面研究间歇输片中胶片的下冲规律。

This paper discusses craft of burrfree up-down blanking,function of lower blanking equipment and determination of lower blanking force,and does structure and parameter design for lower blanking mechanism.

论述了无毛刺上、下冲裁工艺、下冲机构的作用及下冲力的确定,并对下冲机构进行了结构和参数设计。

Effect of subcornea wash and opening wash of LASIK on early syndrome of cornea;

LASIK中瓣下冲洗与开放式大冲洗对角膜早期并发症的影响