28
2009
09

行业标准规范英汉对照-工艺装备2

151 GB/T 4257-1984 扩孔钻技术条件 Core drills--Technical requirements
152 GB/T 4258-1984 60°、90°、120°直柄锥面锪钻 Countersinks with parallel shanks for angles 60°90°and 120°inclusive
153 GB/T 4259-1984 锥面锪钻技术条件 Countersinks--technical requirements
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