line-level: 2" class=MsoNormal>Study and Application of High Efficiency Hydro-Hammer
///As the new products with high efficiency, convenience and energy-saving, YZX series high efficient hydro-hammer and SYZX series wire-line coring hydro-hammer overcame the unfavorable factors of traditional hydro-hammer. By the basic theoretical research, structural optimization design and scale development, hydro-hammer technology has been largely improved in