... 〖low-lying〗低洼 〖besunken;hollow;low-lying〗∶地面下陷;凹陷 〖deephole〗∶深坑 ...
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deephole prospecting 深孔勘探
deephole and chamber 深孔硐室
deephole presplitting blasting 深孔预裂爆破
deephole pre splitting blasting 深孔预裂爆破
ringlike deephole drilling machine 环形深孔钻机
horizonting deephole drilling mvery singleine 卧式深孔钻床
horizontwis deephole drilling mvery singleine 卧式深孔钻床
The reasonable hole pattern of deephole blasting was utilized to make fully use of the explosive energy to improve the crushed ratio to lower the boulder yield and to obtain better dam rocks.
深孔爆破采用合理的布孔方式，使炸药爆炸能量得以充分发挥，破碎率提高，大块度降低，从而获得较理想的堆石坝石料。
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