无压隧洞多采用圆拱直墙形断面。
Free-flow tunnel used more round arch straight wall form cross-section.
盘道岭隧洞是引大入秦灌溉工程总干渠上最长的无压引水隧洞。
The Pandaoling tunnel is the longest non-pressure diversion tunnel of the main channel from Datong river to water irrigation project at Qinwangchuan region.
浸渍合金是冷压浸渍、无压浸渍和PDC钻头制造中的重要材料。
Maceration alloy is an important material in the coldpressed maceration, pressureless maceration and PDC bit manufacture.
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