权威例句
Air Drilling Operations Improved by Percussion-Bit/Hammer-Tool Tandem
AIR DRILLING METHOD USING CONTROLLED SPLIT STREAM
Chip-collecting attachment for a hand-held air drill
FGC-15D large-diameter DTH air hammer drilling system and its application in offshore rock-socketed pile hole drilling
Down-Hole Flow Field Study on Air Hammer Drill Bit
Rock breaking mechanism of air drilling with air hammer
Application issue on air hammers drilling technique
Application and Evaluation of Air-hammer Drilling in the Permian Basin
Evaluation of Layout of Air Drill Hammer with Smooth Adjustment of Impact Impulse Frequency
Small-size downhole air drill hammers of increased capacity
