... 海底操作员 aquanaut 孔底 bottom hole; face of hole; hole foe; toe of hole 公开市场操作暂停 suspending operations ...
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分析了其中4种孔底换钻头钻具的结构及工作原理；
The esigns and working principles of 4 types of it are analysed.
现场的应用实践证明，孔底起爆技术可以获得良好的经济技术效果。
The practical application has proven that hole-bottom initiating technique can achieve better technical results and economic benefits.
为此而开发了新型矿用智能钻孔测温仪器，用于孔底温度信息的采集。
So this thermometric indicator instrument has been developed for the collection of the hole temperature information.
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