空孔 meaning in Chinese

trepan

A model for analysis of the blasting effect of parallel cut
含空孔直眼掏槽爆破效果分析模型
Experimental and theoretical study of parallel hole cut blasting with cavity
空孔直眼掏槽成腔模型理论与实践分析
Mechanical model and analysis of initiation delay time of p arallel cut blasting
空孔直眼掏槽微差起爆时间的力学模型及分析
Paper tape punch
纸带空孔机
Study on blasting mechanism and its engineering use of spiral cutting with big empty hole in rock under - excavation
岩石工程大空孔螺旋掏槽爆破机理研究及应用

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