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关注：1
2013-05-23 12:21
求翻译：The principle of the large-diameter DTH air hammer drilling system is shown in Fig.1. Compressed air is injected into the large-diameter hollow-through DTH air hammer through the rubber tube,the swivel and the feeding tube. The hammer is actuated and its piston blows the button bit at high frequency. And the rock at th是什么意思？ 待解决
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The principle of the large-diameter DTH air hammer drilling system is shown in Fig.1. Compressed air is injected into the large-diameter hollow-through DTH air hammer through the rubber tube,the swivel and the feeding tube. The hammer is actuated and its piston blows the button bit at high frequency. And the rock at th
问题补充： |
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