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noun
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verb
subdrill
n
expl.
超深
;
钻孔加深
;
超钻
又称超钻。在分段爆破底板计划崩落水平以下钻出的炮孔长度。由于分段底的约束较大,有必要在分段底板下钻孔以装填较多炸药作为底部装药。参见 over-drilling depth; subgrade, excess drilling
subdrill
v
gen.
先钻
;
预钻
;
超钻
;
底钻
;
把孔钻到一定大小以便用铰刀精加工
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