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| 线型掏槽; 直孔掏槽; 平行孔掏槽掏槽的一种形式，主要特点是在开挖面的中央部位，垂直于开挖面钻凿若干空孔，在其周围平行钻凿一些装药的炮孔。爆破时，装药孔指向附近的空孔〈相当于临空面〉进行爆破掏槽 | |||
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