Literature research of air hammer drilling in domestic and overseas.

国内外空气锤钻井技术的文献调研。

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This paper collects air hammer' using status in oil and gas fields drilling site at home and abroad.

收集了国内外空气锤技术在油气田钻井现场的使用现状。

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The contents of the paper include:the comparison of the electrohydraulic hammer and the steam—air hammer;

其中包括：电液锤与蒸汽-空气锤工作状况的比较；

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If you want to understand what is happening there, imagine: Under the Liberty Tree that stood in Boston Common, early in the first American Revolution, any and all could come to air their grievances and hammer out solutions collectively, and it was there the promise of American democracy first took root.

FORBES: Occupy Wall Street And The Rhetoric of Equality

Then I walked back along that row of mirrors, swinging the hammer and sending bright spikes of glass into the summer air.

NEWYORKER: Miracle Polish

Hell, thought Mike Hammer, he could have flown back to Newark on Hooters Air, with two beautiful Hooters girls attending to make sure his seatbelt was securely fastened.

ECONOMIST: Robert Brooks and Mickey Spillane