threeply是什么意思

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用法例句

Analysis on coal quality at light mining face in “three-soft”middle thick seam;

“三软”中厚煤层轻放回采煤质问题分析

Comprehensive Gas Drainage Technology of Fully Mechanized Mining Face in Seam with Soft Roof,Soft Coal and Soft Floor

三软厚煤层综采工作面瓦斯综合抽采技术

"Three soft" in thick Coal Comprehensive mechanization mining stent selection of importance

“三软”中厚煤层综采支架选型的重要性

Research and Application on Synthesis Technology of Extinguishing and Preventing Fire in Mechanized Caving Face of Three-soft Coal Seam

“三软”易燃厚煤层自然火灾综合防治技术研究

Application of Fully Mechanized Mining Technology with Caving of Roof Coal in "Three Soft" Large Clined Angle Thick Coal Seam Mining

综采放顶煤技术在“三软”大倾角厚煤层开采中的应用

The anchor net supporting application in high seam tunneling of Sanyuan coal industry

锚网支护在三元煤业厚煤层巷道掘进中的应用

Gateway Support Modes and Parameter Optimization of Fully Mechanized Top Coal Caving Mining Face in Soft and Thick Seam

软厚煤层综放工作面巷道支护形式与参数优化

Technology of Gas Outburst Elimination,Gas and Coal Dust Management with Water Injection in Coal Seam at Coal Face in "Three Soft" Coal Seam

“三软”煤层采煤工作面煤层注水消突治理瓦斯、煤尘技术

Selection of Hydraulic Powered Top Coal Caving Support and Three Equipment Matching Applied to Deep Inclined Seam with Soft Roof,Soft Coal and Soft Floor

大倾角三软煤层放顶煤支架选型及三机配套

Study on Key Technologies of Reasonable Mining in the Condition of Soft Coal, Thick-hard Roof and Contiguous Seams;

软煤、厚硬顶板、极近距离煤层合理开采关键技术研究

Analogue Simulation Research on Roof Moving Rule of Two Soft and One Hard and Largely Inequality Depth Coal Seam in Yunmei No.1 Coal Mine

云煤一矿两软一硬大厚差煤层顶板活动规律研究

Research on mining technology of combined mining at large inclined angle "three soft" coal seam

“三软”煤层大倾角综采回采工艺研究

Light Drills Digs "Three soft" Coal Bed Coal Lane Tunneling Application

轻型钻掘机在“三软”煤层煤巷掘进中的应用

Application of big-obliquity angle mining in three-soft seam in Shitai Coal Mine

“三软”煤层大倾角开采在石台煤矿的应用

Deep "three soft" measures inclined roadway open seam of cosl-process research of technologies

深部“三软”煤层斜井措施巷揭煤防突技术研究

Fully Mechanized Top Coal Caving Mining Technology in Combined Seams with Close Distance and with Soft Roof,Soft Coal and Soft Floor in Guobei Mine

涡北煤矿近距离三软煤层合并综放开采技术

Research and Application of Strengthening Technology at Coal Roadway Crossing Point in "Three Soft" Coal Seam

“三软”煤层煤巷交岔点加固技术研究与应用

Application of Coal-bearing Formation Rock Depositional Features in Three-soft Coal Seam

含煤岩系沉积特征在“三软”煤层中的应用

Application of Triangular Drilling Rod to Gas Drainage Borehole Drilling in Medium Soft Seam

三棱钻杆在中软煤层顺层瓦斯抽排钻孔的应用