pren
- 网络耐点蚀当量;耐点蚀当量数;蚀当量值
pren-
Pren specializes in design , manufacture and sale of valve in the HVAC water system for years .
公司主要从事中央空调类水系统阀门的设计、生产和销售。
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In this paper the equation of cam proflogram has been established and its application to the cam design for the roller pren has been discussed .
白文给出了凸轮轮廓直线的数学求解办法，并正在滚压成型机凸轮设想中失去详细使用。