Problems to be focused on in hot - stoppling of gas transmission pipeline with rubber plug 输气管道囊式封堵需注意的问题
2.
Technical standard of tapping plugging on steel pipeline - part 1 : plug cylinder stopple 钢制管道封堵技术规程.第1部分:塞式筒式封堵
3.
Metalline phase diagram experimental stove , microcomputer controller , accessories ( from front to back : platinic resistance , rubber stopple and stainless steel thimble inserted into the glass tube , white carborundum tube 从前向后为铂电阻、橡皮塞与不锈钢套管插在玻璃管中、白色碳化硅管)
