Corrugated type ductile cast iron segment
波纹形铸铁管片
To view this segment, type an administrator user name and password
要查看此段，请输入管理员的用户名和口令
The editing type of a new segment must be either automatic or corner.
新线段的编辑类型必须是自动或折角。
Simplification of hydraulic computing method for segment type of depressed shadow mask
圆缺型减压孔板水力计算方法的简化
Study on A New Type of Diamond Grinding Segment for Rough and Middle Rough Working Stones
用于花岗石粗, 中磨的金刚石磨具的研制
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