The value of SEDD is nearly equal to that of specific energy of percussive drilling(SEPD) in moderately weathered granite.
在软的全风化及强风化花岗岩中，金刚石钻进比功值低于冲击凿碎比功值；
The value of SEDD is nearly equal to that of specific energy of percussive drilling(SEPD) in moderately weathered granite.
在软的全风化及强风化花岗岩中，金刚石钻进比功值低于冲击凿碎比功值；
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