This unit group includes excavating, grading, paving, drilling and blasting contractors who own and operate their own business.
本单元组包括拥有和经营自己生意的挖掘，分级，铺路，钻井和爆破承建商。
A new type of close blasting network system of Nonel tube with four-path reflecting unit as a connector has been developed and its application in mining is realized.
文中对一种矿山新型的导爆管反射四通闭合起爆网路系统进行了可靠性试验、分析和现场应用，效果良好。
The empirical unit consumption of explosive under special conditions is considered as a proper blasting strength, from which the calculation formula for the blasting of cylindrical charge is derived.
再把特定条件下的经验单耗视为合适的爆破作用强度，从而导出柱状药包爆破的计算公式。
Drillers in this unit group operate mobile drilling machines to bore blast holes in open-pit mines and quarries and to bore holes for blasting and for building foundations at construction sites.
该项中的钻探工人操作移动钻孔机实施露天矿和采石场的钻孔爆破以及建筑工地的建筑物基础设施的爆破工作。
Under the condition of certain definite blasting parameters, it was found out that interval charging could reduce unit explosive consumption and also kept good broken effects.
在某些爆破参数确定的条件下，施工中摸索出空气间隔装药结构能降低炸药单耗，同时保证了破碎效果。
This unit group includes excavating, grading, paving, drilling and blasting contractors who own and operate their own business.
该项包括那些拥有和经营自己企业的承包商，涉及的范围有挖掘，分级，铺砌，凿岩爆破这些方面。
This unit group includes excavating, grading, paving, drilling and blasting contractors who own and operate their own business.
该项包括那些拥有和经营自己企业的承包商，涉及的范围有挖掘，分级，铺砌，凿岩爆破这些方面。
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