acid free,acidless,free from acid是什么意思

用法例句

To summarize acid free technology for carbon steel wire drawing Some kinds of technology of wire rod surface treatment in use at present are compared It is put forward that acid free process needs designing systematicall

概述碳钢线材无酸拉丝生产技术,对目前使用的线材表面处理技术进行比较,提出需系统设计无酸工艺的观点。

To introduce the application of pickling free drawing process to semi finished high carbon steel wire production.

介绍无酸洗拉拔工艺在高碳钢丝半成品生产上的应用。