煤矿用金属材料摩擦火花安全性试验方法和判定规则
Testing method and judging rule of safety to friction spark of metallic material for coal mine
标准状态
发布于：2001-03-19
实施于：2001-10-01
已废止
基本信息
内容预览
Testing method and judging rule of safety to friction spark of metallic material for coal mine