down-the-hole drill【矿】;down-hole drill【矿】
潜孔钻机
down-hole drill【矿】;down-the-hole drill【矿】;in-hole perforator【矿】
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相关词条
cleaning of down-hole filters
cleaning of down-hole gravel packs
cleaning of down-hole screens
down-hole flowmeter【油气】
down-hole impacting means
down-hole troublesome condition
down-hole impacting means (hammer)