Abstract:
<正> 射流冲击器是一种新型的地质探钻具(见图1).它是我国于1972年首先研制的,现已推广使用.其结构是由一个能起自反馈振荡作用的水射流功率元件、活塞冲锤机构和砧子等主
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力学与实践
Year: 1980
Issue: 03
Page: 62-64
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